Li2Ni5O9 crystallizes in the triclinic P1 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(13), one O(3), one O(5), one O(6), and one O(8) atom to form LiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(10)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(8)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-15°. In the second Li site, Li(2) is bonded to one O(10), one O(12), one O(18), one O(6), one O(7), and one O(8) atom to form LiO6 octahedra that share  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(5)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-15°. In the third Li site, Li(3) is bonded to one O(10), one O(11), one O(16), one O(17), one O(2), and one O(7) atom to form distorted LiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(10)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra, corners with two equivalent Ni(6)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. In the fourth Li site, Li(4) is bonded to one O(12), one O(13), one O(15), one O(18), one O(5), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(10)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-14°. There are ten inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(12), one O(14), one O(2), one O(3), and one O(8) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-19°. In the second Ni site, Ni(2) is bonded to one O(1), one O(18), one O(2), one O(4), one O(5), and one O(7) atom to form NiO6 octahedra that share corners with two equivalent Li(4)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-14°. In the third Ni site, Ni(3) is bonded to one O(15), one O(16), one O(2), one O(5), one O(8), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-14°. In the fourth Ni site, Ni(4) is bonded to one O(10), one O(11), one O(13), one O(4), one O(6), and one O(7) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-13°. In the fifth Ni site, Ni(5) is bonded to one O(11), one O(12), one O(14), one O(16), one O(5), and one O(7) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra, corners with two equivalent Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-20°. In the sixth Ni site, Ni(6) is bonded to one O(10), one O(12), one O(15), one O(16), one O(3), and one O(6) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-18°. In the seventh Ni site, Ni(7) is bonded to one O(10), one O(13), one O(17), one O(3), one O(8), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra, corners with two equivalent Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-15°. In the eighth Ni site, Ni(8) is bonded to one O(1), one O(11), one O(13), one O(14), one O(17), and one O(18) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra, corners with two equivalent Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-16°. In the ninth Ni site, Ni(9) is bonded to one O(1), one O(14), one O(16), one O(17), one O(3), and one O(4) atom to form NiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(7)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-16°. In the tenth Ni site, Ni(10) is bonded to one O(15), one O(17), one O(18), one O(4), one O(6), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-13°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Ni(1), one Ni(2), one Ni(8), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(12)Li2Ni3 square pyramid,  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(16)LiNi4 square pyramid,  a cornercorner with one O(3)LiNi4 square pyramid, corners with two equivalent O(13)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid,  an edgeedge with one O(3)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ni(1), one Ni(2), and one Ni(3) atom. In the third O site, O(3) is bonded to one Li(1), one Ni(1), one Ni(6), one Ni(7), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(5)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(17)LiNi4 square pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid,  an edgeedge with one O(16)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Ni(10), one Ni(2), one Ni(4), and one Ni(9) atom. In the fifth O site, O(5) is bonded to one Li(1), one Li(4), one Ni(2), one Ni(3), and one Ni(5) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(3)LiNi4 square pyramid, corners with two equivalent O(18)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(16)LiNi4 square pyramid. In the sixth O site, O(6) is bonded to one Li(1), one Li(2), one Ni(10), one Ni(4), and one Ni(6) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(10)Li2Ni3 square pyramid,  a cornercorner with one O(5)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid,  a cornercorner with one O(16)LiNi4 square pyramid,  a cornercorner with one O(17)LiNi4 square pyramid, corners with two equivalent O(12)Li2Ni3 square pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the seventh O site, O(7) is bonded to one Li(2), one Li(3), one Ni(2), one Ni(4), and one Ni(5) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(10)Li2Ni3 square pyramid,  a cornercorner with one O(13)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid,  a cornercorner with one O(17)LiNi4 square pyramid, corners with two equivalent O(12)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid, and  an edgeedge with one O(16)LiNi4 square pyramid. In the eighth O site, O(8) is bonded to one Li(1), one Li(2), one Ni(1), one Ni(3), and one Ni(7) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(18)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(16)LiNi4 square pyramid,  a cornercorner with one O(17)LiNi4 square pyramid,  a cornercorner with one O(3)LiNi4 square pyramid, corners with two equivalent O(13)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Li(4), one Ni(10), one Ni(3), and one Ni(7) atom. In the tenth O site, O(10) is bonded to one Li(2), one Li(3), one Ni(4), one Ni(6), and one Ni(7) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(18)Li2Ni3 square pyramid,  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid, corners with two equivalent O(16)LiNi4 square pyramids,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ni(4), one Ni(5), and one Ni(8) atom. In the twelfth O site, O(12) is bonded to one Li(2), one Li(4), one Ni(1), one Ni(5), and one Ni(6) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(13)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(6)Li2Ni3 square pyramids, corners with two equivalent O(7)Li2Ni3 square pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(16)LiNi4 square pyramid,  an edgeedge with one O(3)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Li(1), one Li(4), one Ni(4), one Ni(7), and one Ni(8) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(12)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid, corners with two equivalent O(8)Li2Ni3 square pyramids, corners with two equivalent O(1)LiNi4 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the fourteenth O site, O(14) is bonded to one Ni(1), one Ni(5), one Ni(8), and one Ni(9) atom to form ONi4 trigonal pyramids that share  a cornercorner with one O(13)Li2Ni3 square pyramid,  a cornercorner with one O(18)Li2Ni3 square pyramid,  a cornercorner with one O(5)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(17)LiNi4 square pyramids,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid,  an edgeedge with one O(16)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the fifteenth O site, O(15) is bonded in a rectangular see-saw-like geometry to one Li(4), one Ni(10), one Ni(3), and one Ni(6) atom. In the sixteenth O site, O(16) is bonded to one Li(3), one Ni(3), one Ni(5), one Ni(6), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(10)Li2Ni3 square pyramids,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid,  an edgeedge with one O(3)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the seventeenth O site, O(17) is bonded to one Li(3), one Ni(10), one Ni(7), one Ni(8), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid, corners with two equivalent O(3)LiNi4 square pyramids, corners with two equivalent O(14)Ni4 trigonal pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(16)LiNi4 square pyramid. In the eighteenth O site, O(18) is bonded to one Li(2), one Li(4), one Ni(10), one Ni(2), and one Ni(8) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(10)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid, corners with two equivalent O(5)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(17)LiNi4 square pyramid.
Li2Ni5O9 crystallizes in the triclinic P1 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(13), one O(3), one O(5), one O(6), and one O(8) atom to form LiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(10)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(8)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-15°. The Li(1)-O(1) bond length is 2.34 Å. The Li(1)-O(13) bond length is 2.09 Å. The Li(1)-O(3) bond length is 2.05 Å. The Li(1)-O(5) bond length is 2.20 Å. The Li(1)-O(6) bond length is 2.25 Å. The Li(1)-O(8) bond length is 2.08 Å. In the second Li site, Li(2) is bonded to one O(10), one O(12), one O(18), one O(6), one O(7), and one O(8) atom to form LiO6 octahedra that share  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(5)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-15°. The Li(2)-O(10) bond length is 2.11 Å. The Li(2)-O(12) bond length is 2.24 Å. The Li(2)-O(18) bond length is 2.13 Å. The Li(2)-O(6) bond length is 2.14 Å. The Li(2)-O(7) bond length is 2.25 Å. The Li(2)-O(8) bond length is 2.06 Å. In the third Li site, Li(3) is bonded to one O(10), one O(11), one O(16), one O(17), one O(2), and one O(7) atom to form distorted LiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(10)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra, corners with two equivalent Ni(6)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. The Li(3)-O(10) bond length is 2.08 Å. The Li(3)-O(11) bond length is 2.07 Å. The Li(3)-O(16) bond length is 2.07 Å. The Li(3)-O(17) bond length is 2.48 Å. The Li(3)-O(2) bond length is 2.02 Å. The Li(3)-O(7) bond length is 2.31 Å. In the fourth Li site, Li(4) is bonded to one O(12), one O(13), one O(15), one O(18), one O(5), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(10)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-14°. The Li(4)-O(12) bond length is 2.15 Å. The Li(4)-O(13) bond length is 2.08 Å. The Li(4)-O(15) bond length is 2.23 Å. The Li(4)-O(18) bond length is 2.06 Å. The Li(4)-O(5) bond length is 2.04 Å. The Li(4)-O(9) bond length is 2.13 Å. There are ten inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(12), one O(14), one O(2), one O(3), and one O(8) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-19°. The Ni(1)-O(1) bond length is 2.08 Å. The Ni(1)-O(12) bond length is 1.94 Å. The Ni(1)-O(14) bond length is 1.90 Å. The Ni(1)-O(2) bond length is 1.95 Å. The Ni(1)-O(3) bond length is 2.08 Å. The Ni(1)-O(8) bond length is 1.87 Å. In the second Ni site, Ni(2) is bonded to one O(1), one O(18), one O(2), one O(4), one O(5), and one O(7) atom to form NiO6 octahedra that share corners with two equivalent Li(4)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-14°. The Ni(2)-O(1) bond length is 1.89 Å. The Ni(2)-O(18) bond length is 2.09 Å. The Ni(2)-O(2) bond length is 1.90 Å. The Ni(2)-O(4) bond length is 1.90 Å. The Ni(2)-O(5) bond length is 2.09 Å. The Ni(2)-O(7) bond length is 1.91 Å. In the third Ni site, Ni(3) is bonded to one O(15), one O(16), one O(2), one O(5), one O(8), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-14°. The Ni(3)-O(15) bond length is 1.90 Å. The Ni(3)-O(16) bond length is 2.09 Å. The Ni(3)-O(2) bond length is 1.90 Å. The Ni(3)-O(5) bond length is 1.90 Å. The Ni(3)-O(8) bond length is 2.10 Å. The Ni(3)-O(9) bond length is 1.91 Å. In the fourth Ni site, Ni(4) is bonded to one O(10), one O(11), one O(13), one O(4), one O(6), and one O(7) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-13°. The Ni(4)-O(10) bond length is 1.92 Å. The Ni(4)-O(11) bond length is 1.90 Å. The Ni(4)-O(13) bond length is 2.08 Å. The Ni(4)-O(4) bond length is 2.08 Å. The Ni(4)-O(6) bond length is 1.92 Å. The Ni(4)-O(7) bond length is 1.93 Å. In the fifth Ni site, Ni(5) is bonded to one O(11), one O(12), one O(14), one O(16), one O(5), and one O(7) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra, corners with two equivalent Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-20°. The Ni(5)-O(11) bond length is 1.92 Å. The Ni(5)-O(12) bond length is 1.89 Å. The Ni(5)-O(14) bond length is 1.90 Å. The Ni(5)-O(16) bond length is 1.86 Å. The Ni(5)-O(5) bond length is 1.89 Å. The Ni(5)-O(7) bond length is 1.90 Å. In the sixth Ni site, Ni(6) is bonded to one O(10), one O(12), one O(15), one O(16), one O(3), and one O(6) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-18°. The Ni(6)-O(10) bond length is 2.10 Å. The Ni(6)-O(12) bond length is 1.94 Å. The Ni(6)-O(15) bond length is 1.88 Å. The Ni(6)-O(16) bond length is 2.09 Å. The Ni(6)-O(3) bond length is 1.87 Å. The Ni(6)-O(6) bond length is 1.94 Å. In the seventh Ni site, Ni(7) is bonded to one O(10), one O(13), one O(17), one O(3), one O(8), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra, corners with two equivalent Ni(9)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-15°. The Ni(7)-O(10) bond length is 1.88 Å. The Ni(7)-O(13) bond length is 1.90 Å. The Ni(7)-O(17) bond length is 2.05 Å. The Ni(7)-O(3) bond length is 2.11 Å. The Ni(7)-O(8) bond length is 1.93 Å. The Ni(7)-O(9) bond length is 1.90 Å. In the eighth Ni site, Ni(8) is bonded to one O(1), one O(11), one O(13), one O(14), one O(17), and one O(18) atom to form NiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Ni(9)O6 octahedra, corners with two equivalent Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-16°. The Ni(8)-O(1) bond length is 1.95 Å. The Ni(8)-O(11) bond length is 1.93 Å. The Ni(8)-O(13) bond length is 1.90 Å. The Ni(8)-O(14) bond length is 2.03 Å. The Ni(8)-O(17) bond length is 2.02 Å. The Ni(8)-O(18) bond length is 1.92 Å. In the ninth Ni site, Ni(9) is bonded to one O(1), one O(14), one O(16), one O(17), one O(3), and one O(4) atom to form NiO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(4)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(7)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(10)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra, and  an edgeedge with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-16°. The Ni(9)-O(1) bond length is 2.07 Å. The Ni(9)-O(14) bond length is 2.02 Å. The Ni(9)-O(16) bond length is 2.05 Å. The Ni(9)-O(17) bond length is 2.04 Å. The Ni(9)-O(3) bond length is 2.08 Å. The Ni(9)-O(4) bond length is 2.04 Å. In the tenth Ni site, Ni(10) is bonded to one O(15), one O(17), one O(18), one O(4), one O(6), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(4)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  an edgeedge with one Ni(9)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-13°. The Ni(10)-O(15) bond length is 1.90 Å. The Ni(10)-O(17) bond length is 1.86 Å. The Ni(10)-O(18) bond length is 1.87 Å. The Ni(10)-O(4) bond length is 1.88 Å. The Ni(10)-O(6) bond length is 1.91 Å. The Ni(10)-O(9) bond length is 1.89 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Ni(1), one Ni(2), one Ni(8), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(12)Li2Ni3 square pyramid,  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(16)LiNi4 square pyramid,  a cornercorner with one O(3)LiNi4 square pyramid, corners with two equivalent O(13)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid,  an edgeedge with one O(3)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ni(1), one Ni(2), and one Ni(3) atom. In the third O site, O(3) is bonded to one Li(1), one Ni(1), one Ni(6), one Ni(7), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(5)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(17)LiNi4 square pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid,  an edgeedge with one O(16)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Ni(10), one Ni(2), one Ni(4), and one Ni(9) atom. In the fifth O site, O(5) is bonded to one Li(1), one Li(4), one Ni(2), one Ni(3), and one Ni(5) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(3)LiNi4 square pyramid, corners with two equivalent O(18)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(16)LiNi4 square pyramid. In the sixth O site, O(6) is bonded to one Li(1), one Li(2), one Ni(10), one Ni(4), and one Ni(6) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(10)Li2Ni3 square pyramid,  a cornercorner with one O(5)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid,  a cornercorner with one O(16)LiNi4 square pyramid,  a cornercorner with one O(17)LiNi4 square pyramid, corners with two equivalent O(12)Li2Ni3 square pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the seventh O site, O(7) is bonded to one Li(2), one Li(3), one Ni(2), one Ni(4), and one Ni(5) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(10)Li2Ni3 square pyramid,  a cornercorner with one O(13)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid,  a cornercorner with one O(17)LiNi4 square pyramid, corners with two equivalent O(12)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid, and  an edgeedge with one O(16)LiNi4 square pyramid. In the eighth O site, O(8) is bonded to one Li(1), one Li(2), one Ni(1), one Ni(3), and one Ni(7) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(18)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(16)LiNi4 square pyramid,  a cornercorner with one O(17)LiNi4 square pyramid,  a cornercorner with one O(3)LiNi4 square pyramid, corners with two equivalent O(13)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Li(4), one Ni(10), one Ni(3), and one Ni(7) atom. In the tenth O site, O(10) is bonded to one Li(2), one Li(3), one Ni(4), one Ni(6), and one Ni(7) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(18)Li2Ni3 square pyramid,  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid, corners with two equivalent O(16)LiNi4 square pyramids,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ni(4), one Ni(5), and one Ni(8) atom. In the twelfth O site, O(12) is bonded to one Li(2), one Li(4), one Ni(1), one Ni(5), and one Ni(6) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(13)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(6)Li2Ni3 square pyramids, corners with two equivalent O(7)Li2Ni3 square pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(8)Li2Ni3 square pyramid,  an edgeedge with one O(16)LiNi4 square pyramid,  an edgeedge with one O(3)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Li(1), one Li(4), one Ni(4), one Ni(7), and one Ni(8) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(12)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid, corners with two equivalent O(8)Li2Ni3 square pyramids, corners with two equivalent O(1)LiNi4 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the fourteenth O site, O(14) is bonded to one Ni(1), one Ni(5), one Ni(8), and one Ni(9) atom to form ONi4 trigonal pyramids that share  a cornercorner with one O(13)Li2Ni3 square pyramid,  a cornercorner with one O(18)Li2Ni3 square pyramid,  a cornercorner with one O(5)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(17)LiNi4 square pyramids,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid,  an edgeedge with one O(16)LiNi4 square pyramid, and  an edgeedge with one O(3)LiNi4 square pyramid. In the fifteenth O site, O(15) is bonded in a rectangular see-saw-like geometry to one Li(4), one Ni(10), one Ni(3), and one Ni(6) atom. In the sixteenth O site, O(16) is bonded to one Li(3), one Ni(3), one Ni(5), one Ni(6), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid,  a cornercorner with one O(1)LiNi4 square pyramid, corners with two equivalent O(10)Li2Ni3 square pyramids,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(5)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(17)LiNi4 square pyramid,  an edgeedge with one O(3)LiNi4 square pyramid, and  an edgeedge with one O(14)Ni4 trigonal pyramid. In the seventeenth O site, O(17) is bonded to one Li(3), one Ni(10), one Ni(7), one Ni(8), and one Ni(9) atom to form OLiNi4 square pyramids that share  a cornercorner with one O(6)Li2Ni3 square pyramid,  a cornercorner with one O(7)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid, corners with two equivalent O(3)LiNi4 square pyramids, corners with two equivalent O(14)Ni4 trigonal pyramids,  an edgeedge with one O(10)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(18)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(16)LiNi4 square pyramid. In the eighteenth O site, O(18) is bonded to one Li(2), one Li(4), one Ni(10), one Ni(2), and one Ni(8) atom to form OLi2Ni3 square pyramids that share  a cornercorner with one O(10)Li2Ni3 square pyramid,  a cornercorner with one O(8)Li2Ni3 square pyramid, corners with two equivalent O(5)Li2Ni3 square pyramids,  a cornercorner with one O(14)Ni4 trigonal pyramid,  an edgeedge with one O(12)Li2Ni3 square pyramid,  an edgeedge with one O(13)Li2Ni3 square pyramid,  an edgeedge with one O(6)Li2Ni3 square pyramid,  an edgeedge with one O(7)Li2Ni3 square pyramid,  an edgeedge with one O(1)LiNi4 square pyramid, and  an edgeedge with one O(17)LiNi4 square pyramid.