Li19(CoO4)4 crystallizes in the monoclinic Pm space group. There are thirteen inequivalent Li sites. In the first Li site, Li(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), one O(12), and one O(2) atom. In the second Li site, Li(2) is bonded to one O(3), one O(5), and two equivalent O(12) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Li(12)O4 tetrahedra, corners with two equivalent Co(4)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids,  an edgeedge with one Co(2)O4 tetrahedra, and edges with two equivalent Li(3)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(1), one O(12), one O(4), and one O(5) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra,  an edgeedge with one Li(12)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. In the fourth Li site, Li(4) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), and two equivalent O(6) atoms. In the fifth Li site, Li(5) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids,  an edgeedge with one Li(9)O4 tetrahedra, and  an edgeedge with one Co(2)O4 tetrahedra. In the sixth Li site, Li(6) is bonded in a 4-coordinate geometry to one O(2), one O(4), and two equivalent O(7) atoms. In the seventh Li site, Li(7) is bonded in a 6-coordinate geometry to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the eighth Li site, Li(8) is bonded in a 4-coordinate geometry to one O(11), one O(9), and two equivalent O(6) atoms. In the ninth Li site, Li(9) is bonded to one O(10), one O(11), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, corners with two equivalent Li(9)O4 tetrahedra,  an edgeedge with one Co(3)O4 tetrahedra, and  an edgeedge with one Li(5)O4 trigonal pyramid. In the tenth Li site, Li(10) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(9), and two equivalent O(7) atoms. In the eleventh Li site, Li(11) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(8), and two equivalent O(12) atoms. In the twelfth Li site, Li(12) is bonded to one O(1), one O(12), one O(8), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, corners with two equivalent Li(12)O4 tetrahedra,  an edgeedge with one Li(3)O4 tetrahedra, and  an edgeedge with one Co(4)O4 tetrahedra. In the thirteenth Li site, Li(13) is bonded in a 3-coordinate geometry to one O(10) and two equivalent O(1) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent Li(12)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids, and edges with two equivalent Li(3)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(3), one O(5), and two equivalent O(6) atoms to form CoO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(9)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and edges with two equivalent Li(5)O4 trigonal pyramids. In the third Co site, Co(3) is bonded to one O(10), one O(8), and two equivalent O(7) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent Li(12)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids, and edges with two equivalent Li(9)O4 tetrahedra. In the fourth Co site, Co(4) is bonded to one O(11), one O(9), and two equivalent O(12) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(9)O4 tetrahedra, and edges with two equivalent Li(12)O4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Li(1), one Li(12), one Li(13), one Li(3), and one Co(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Li(4), one Li(6), two equivalent Li(1), two equivalent Li(5), and one Co(1) atom. In the third O site, O(3) is bonded in a trigonal pyramidal geometry to one Li(2), two equivalent Li(5), and one Co(2) atom. In the fourth O site, O(4) is bonded in a 7-coordinate geometry to one Li(4), one Li(6), two equivalent Li(3), two equivalent Li(7), and one Co(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Li(2), two equivalent Li(3), two equivalent Li(7), and one Co(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Li(4), one Li(5), one Li(7), one Li(8), one Li(9), and one Co(2) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Li(10), one Li(5), one Li(6), one Li(7), one Li(9), and one Co(3) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Li(11), two equivalent Li(12), two equivalent Li(7), and one Co(3) atom. In the ninth O site, O(9) is bonded in a 7-coordinate geometry to one Li(10), one Li(8), two equivalent Li(12), two equivalent Li(7), and one Co(4) atom. In the tenth O site, O(10) is bonded in a 7-coordinate geometry to one Li(11), one Li(13), two equivalent Li(1), two equivalent Li(9), and one Co(3) atom. In the eleventh O site, O(11) is bonded in a distorted pentagonal bipyramidal geometry to one Li(10), one Li(8), two equivalent Li(1), two equivalent Li(9), and one Co(4) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Li(1), one Li(11), one Li(12), one Li(2), one Li(3), and one Co(4) atom.
Li19(CoO4)4 crystallizes in the monoclinic Pm space group. There are thirteen inequivalent Li sites. In the first Li site, Li(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), one O(12), and one O(2) atom. The Li(1)-O(1) bond length is 2.04 Å. The Li(1)-O(10) bond length is 2.39 Å. The Li(1)-O(11) bond length is 2.24 Å. The Li(1)-O(12) bond length is 2.07 Å. The Li(1)-O(2) bond length is 2.51 Å. In the second Li site, Li(2) is bonded to one O(3), one O(5), and two equivalent O(12) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Li(12)O4 tetrahedra, corners with two equivalent Co(4)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids,  an edgeedge with one Co(2)O4 tetrahedra, and edges with two equivalent Li(3)O4 tetrahedra. The Li(2)-O(3) bond length is 1.91 Å. The Li(2)-O(5) bond length is 2.08 Å. Both Li(2)-O(12) bond lengths are 1.88 Å. In the third Li site, Li(3) is bonded to one O(1), one O(12), one O(4), and one O(5) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra,  an edgeedge with one Li(12)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. The Li(3)-O(1) bond length is 2.01 Å. The Li(3)-O(12) bond length is 2.07 Å. The Li(3)-O(4) bond length is 1.97 Å. The Li(3)-O(5) bond length is 1.95 Å. In the fourth Li site, Li(4) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), and two equivalent O(6) atoms. The Li(4)-O(2) bond length is 1.99 Å. The Li(4)-O(4) bond length is 2.07 Å. Both Li(4)-O(6) bond lengths are 2.39 Å. In the fifth Li site, Li(5) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids,  an edgeedge with one Li(9)O4 tetrahedra, and  an edgeedge with one Co(2)O4 tetrahedra. The Li(5)-O(2) bond length is 1.93 Å. The Li(5)-O(3) bond length is 1.94 Å. The Li(5)-O(6) bond length is 2.09 Å. The Li(5)-O(7) bond length is 2.01 Å. In the sixth Li site, Li(6) is bonded in a 4-coordinate geometry to one O(2), one O(4), and two equivalent O(7) atoms. The Li(6)-O(2) bond length is 2.17 Å. The Li(6)-O(4) bond length is 1.95 Å. Both Li(6)-O(7) bond lengths are 1.91 Å. In the seventh Li site, Li(7) is bonded in a 6-coordinate geometry to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Li(7)-O(4) bond length is 2.55 Å. The Li(7)-O(5) bond length is 2.49 Å. The Li(7)-O(6) bond length is 2.07 Å. The Li(7)-O(7) bond length is 2.05 Å. The Li(7)-O(8) bond length is 2.29 Å. The Li(7)-O(9) bond length is 2.32 Å. In the eighth Li site, Li(8) is bonded in a 4-coordinate geometry to one O(11), one O(9), and two equivalent O(6) atoms. The Li(8)-O(11) bond length is 2.17 Å. The Li(8)-O(9) bond length is 1.94 Å. Both Li(8)-O(6) bond lengths are 1.89 Å. In the ninth Li site, Li(9) is bonded to one O(10), one O(11), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, corners with two equivalent Li(9)O4 tetrahedra,  an edgeedge with one Co(3)O4 tetrahedra, and  an edgeedge with one Li(5)O4 trigonal pyramid. The Li(9)-O(10) bond length is 1.97 Å. The Li(9)-O(11) bond length is 1.93 Å. The Li(9)-O(6) bond length is 2.02 Å. The Li(9)-O(7) bond length is 1.94 Å. In the tenth Li site, Li(10) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(9), and two equivalent O(7) atoms. The Li(10)-O(11) bond length is 2.06 Å. The Li(10)-O(9) bond length is 2.07 Å. Both Li(10)-O(7) bond lengths are 2.26 Å. In the eleventh Li site, Li(11) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(8), and two equivalent O(12) atoms. The Li(11)-O(10) bond length is 2.02 Å. The Li(11)-O(8) bond length is 1.96 Å. Both Li(11)-O(12) bond lengths are 2.30 Å. In the twelfth Li site, Li(12) is bonded to one O(1), one O(12), one O(8), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, corners with two equivalent Li(12)O4 tetrahedra,  an edgeedge with one Li(3)O4 tetrahedra, and  an edgeedge with one Co(4)O4 tetrahedra. The Li(12)-O(1) bond length is 1.93 Å. The Li(12)-O(12) bond length is 2.00 Å. The Li(12)-O(8) bond length is 1.93 Å. The Li(12)-O(9) bond length is 2.00 Å. In the thirteenth Li site, Li(13) is bonded in a 3-coordinate geometry to one O(10) and two equivalent O(1) atoms. The Li(13)-O(10) bond length is 1.98 Å. Both Li(13)-O(1) bond lengths are 1.83 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent Li(12)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids, and edges with two equivalent Li(3)O4 tetrahedra. The Co(1)-O(2) bond length is 1.90 Å. The Co(1)-O(4) bond length is 1.98 Å. Both Co(1)-O(1) bond lengths are 1.82 Å. In the second Co site, Co(2) is bonded to one O(3), one O(5), and two equivalent O(6) atoms to form CoO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(9)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and edges with two equivalent Li(5)O4 trigonal pyramids. The Co(2)-O(3) bond length is 1.76 Å. The Co(2)-O(5) bond length is 1.74 Å. Both Co(2)-O(6) bond lengths are 1.79 Å. In the third Co site, Co(3) is bonded to one O(10), one O(8), and two equivalent O(7) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent Li(12)O4 tetrahedra, corners with two equivalent Li(5)O4 trigonal pyramids, and edges with two equivalent Li(9)O4 tetrahedra. The Co(3)-O(10) bond length is 1.97 Å. The Co(3)-O(8) bond length is 1.89 Å. Both Co(3)-O(7) bond lengths are 1.85 Å. In the fourth Co site, Co(4) is bonded to one O(11), one O(9), and two equivalent O(12) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(9)O4 tetrahedra, and edges with two equivalent Li(12)O4 tetrahedra. The Co(4)-O(11) bond length is 1.91 Å. The Co(4)-O(9) bond length is 1.94 Å. Both Co(4)-O(12) bond lengths are 1.84 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Li(1), one Li(12), one Li(13), one Li(3), and one Co(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Li(4), one Li(6), two equivalent Li(1), two equivalent Li(5), and one Co(1) atom. In the third O site, O(3) is bonded in a trigonal pyramidal geometry to one Li(2), two equivalent Li(5), and one Co(2) atom. In the fourth O site, O(4) is bonded in a 7-coordinate geometry to one Li(4), one Li(6), two equivalent Li(3), two equivalent Li(7), and one Co(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Li(2), two equivalent Li(3), two equivalent Li(7), and one Co(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Li(4), one Li(5), one Li(7), one Li(8), one Li(9), and one Co(2) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Li(10), one Li(5), one Li(6), one Li(7), one Li(9), and one Co(3) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Li(11), two equivalent Li(12), two equivalent Li(7), and one Co(3) atom. In the ninth O site, O(9) is bonded in a 7-coordinate geometry to one Li(10), one Li(8), two equivalent Li(12), two equivalent Li(7), and one Co(4) atom. In the tenth O site, O(10) is bonded in a 7-coordinate geometry to one Li(11), one Li(13), two equivalent Li(1), two equivalent Li(9), and one Co(3) atom. In the eleventh O site, O(11) is bonded in a distorted pentagonal bipyramidal geometry to one Li(10), one Li(8), two equivalent Li(1), two equivalent Li(9), and one Co(4) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Li(1), one Li(11), one Li(12), one Li(2), one Li(3), and one Co(4) atom.