Li2Ni2Si5O13 crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(12), and one O(13) atom. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(5), and one O(8) atom. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(12), one O(7), one O(8), and two equivalent O(2) atoms to form distorted NiO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  a cornercorner with one Ni(2)O5 trigonal bipyramid,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent Ni(2)O5 trigonal bipyramids. In the second Ni site, Ni(2) is bonded to one O(10), one O(12), one O(2), one O(7), and one O(8) atom to form distorted NiO5 trigonal bipyramids that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 60-68°. In the second Si site, Si(2) is bonded to one O(1), one O(11), one O(13), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the third Si site, Si(3) is bonded to one O(4), one O(7), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Ni(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 50-62°. In the fourth Si site, Si(4) is bonded to one O(12), one O(13), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 55°. In the fifth Si site, Si(5) is bonded to one O(10), one O(11), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Li(2), one Ni(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ni(2), two equivalent Ni(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(5) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ni(1), one Ni(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Li(2), one Ni(1), one Ni(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Ni(2), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(1), one Ni(1), one Ni(2), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(2), and one Si(4) atom.
Li2Ni2Si5O13 crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(12), and one O(13) atom. The Li(1)-O(1) bond length is 1.88 Å. The Li(1)-O(10) bond length is 1.85 Å. The Li(1)-O(12) bond length is 2.43 Å. The Li(1)-O(13) bond length is 1.88 Å. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(5), and one O(8) atom. The Li(2)-O(1) bond length is 2.03 Å. The Li(2)-O(10) bond length is 2.08 Å. The Li(2)-O(5) bond length is 2.07 Å. The Li(2)-O(8) bond length is 1.88 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(12), one O(7), one O(8), and two equivalent O(2) atoms to form distorted NiO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  a cornercorner with one Ni(2)O5 trigonal bipyramid,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent Ni(2)O5 trigonal bipyramids. The Ni(1)-O(1) bond length is 2.09 Å. The Ni(1)-O(12) bond length is 2.07 Å. The Ni(1)-O(7) bond length is 2.08 Å. The Ni(1)-O(8) bond length is 2.48 Å. There is one shorter (2.15 Å) and one longer (2.37 Å) Ni(1)-O(2) bond length. In the second Ni site, Ni(2) is bonded to one O(10), one O(12), one O(2), one O(7), and one O(8) atom to form distorted NiO5 trigonal bipyramids that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 61°. The Ni(2)-O(10) bond length is 2.01 Å. The Ni(2)-O(12) bond length is 2.06 Å. The Ni(2)-O(2) bond length is 2.16 Å. The Ni(2)-O(7) bond length is 2.09 Å. The Ni(2)-O(8) bond length is 2.38 Å. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 60-68°. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.63 Å. The Si(1)-O(5) bond length is 1.65 Å. In the second Si site, Si(2) is bonded to one O(1), one O(11), one O(13), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. The Si(2)-O(1) bond length is 1.60 Å. The Si(2)-O(11) bond length is 1.65 Å. The Si(2)-O(13) bond length is 1.68 Å. The Si(2)-O(6) bond length is 1.60 Å. In the third Si site, Si(3) is bonded to one O(4), one O(7), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Ni(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 50-62°. The Si(3)-O(4) bond length is 1.65 Å. The Si(3)-O(7) bond length is 1.63 Å. The Si(3)-O(8) bond length is 1.62 Å. The Si(3)-O(9) bond length is 1.67 Å. In the fourth Si site, Si(4) is bonded to one O(12), one O(13), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 55°. The Si(4)-O(12) bond length is 1.62 Å. The Si(4)-O(13) bond length is 1.67 Å. The Si(4)-O(5) bond length is 1.63 Å. The Si(4)-O(9) bond length is 1.62 Å. In the fifth Si site, Si(5) is bonded to one O(10), one O(11), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The Si(5)-O(10) bond length is 1.61 Å. The Si(5)-O(11) bond length is 1.65 Å. The Si(5)-O(3) bond length is 1.66 Å. The Si(5)-O(6) bond length is 1.61 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Li(2), one Ni(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ni(2), two equivalent Ni(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(5) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ni(1), one Ni(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Li(2), one Ni(1), one Ni(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Ni(2), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(1), one Ni(1), one Ni(2), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(2), and one Si(4) atom.