Li4Ni5SnO12 crystallizes in the monoclinic C2/m space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form edge-sharing NiO6 octahedra. In the second Ni site, Ni(2) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form NiO6 octahedra that share edges with three equivalent Ni(2)O6 octahedra and edges with three equivalent Sn(1)O6 octahedra. In the third Ni site, Ni(3) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form edge-sharing NiO6 octahedra. Sn(1) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form SnO6 octahedra that share edges with six equivalent Ni(2)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), two equivalent Ni(2), and one Sn(1) atom to form distorted OLi2Ni2Sn trigonal bipyramids that share corners with two equivalent O(2)Li2Ni3 trigonal bipyramids, corners with three equivalent O(1)Li2Ni2Sn trigonal bipyramids,  an edgeedge with one O(2)Li2Ni3 trigonal bipyramid, and edges with four equivalent O(1)Li2Ni2Sn trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Li(1), one Ni(3), and two equivalent Ni(1) atoms to form distorted OLi2Ni3 trigonal bipyramids that share corners with two equivalent O(1)Li2Ni2Sn trigonal bipyramids, corners with three equivalent O(2)Li2Ni3 trigonal bipyramids,  an edgeedge with one O(1)Li2Ni2Sn trigonal bipyramid, and edges with four equivalent O(2)Li2Ni3 trigonal bipyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ni(3) and two equivalent Ni(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Ni(2) and one Sn(1) atom.
Li4Ni5SnO12 crystallizes in the monoclinic C2/m space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There is one shorter (1.98 Å) and one longer (2.02 Å) Li(1)-O(1) bond length. There is one shorter (1.99 Å) and one longer (2.08 Å) Li(1)-O(2) bond length. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form edge-sharing NiO6 octahedra. Both Ni(1)-O(3) bond lengths are 1.86 Å. There are two shorter (1.93 Å) and two longer (1.94 Å) Ni(1)-O(2) bond lengths. In the second Ni site, Ni(2) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form NiO6 octahedra that share edges with three equivalent Ni(2)O6 octahedra and edges with three equivalent Sn(1)O6 octahedra. Both Ni(2)-O(4) bond lengths are 1.90 Å. There are two shorter (1.91 Å) and two longer (2.14 Å) Ni(2)-O(1) bond lengths. In the third Ni site, Ni(3) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form edge-sharing NiO6 octahedra. Both Ni(3)-O(3) bond lengths are 2.07 Å. All Ni(3)-O(2) bond lengths are 2.10 Å. Sn(1) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form SnO6 octahedra that share edges with six equivalent Ni(2)O6 octahedra. Both Sn(1)-O(4) bond lengths are 2.09 Å. All Sn(1)-O(1) bond lengths are 2.07 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), two equivalent Ni(2), and one Sn(1) atom to form distorted OLi2Ni2Sn trigonal bipyramids that share corners with two equivalent O(2)Li2Ni3 trigonal bipyramids, corners with three equivalent O(1)Li2Ni2Sn trigonal bipyramids,  an edgeedge with one O(2)Li2Ni3 trigonal bipyramid, and edges with four equivalent O(1)Li2Ni2Sn trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Li(1), one Ni(3), and two equivalent Ni(1) atoms to form distorted OLi2Ni3 trigonal bipyramids that share corners with two equivalent O(1)Li2Ni2Sn trigonal bipyramids, corners with three equivalent O(2)Li2Ni3 trigonal bipyramids,  an edgeedge with one O(1)Li2Ni2Sn trigonal bipyramid, and edges with four equivalent O(2)Li2Ni3 trigonal bipyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ni(3) and two equivalent Ni(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Ni(2) and one Sn(1) atom.