Li2FeCo9O20 crystallizes in the triclinic P-1 space group. Li(1) is bonded to one O(10), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form distorted LiO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-16°. Fe(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, and edges with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles are 16°. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(7), one O(9), two equivalent O(1), and two equivalent O(3) atoms to form CoO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with three equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles are 15°. In the second Co site, Co(2) is bonded to one O(4), one O(5), one O(6), one O(8), and two equivalent O(2) atoms to form CoO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with three equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the third Co site, Co(3) is bonded to one O(1), one O(3), one O(7), one O(9), and two equivalent O(10) atoms to form CoO6 octahedra that share corners with two equivalent Li(1)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-14°. In the fourth Co site, Co(4) is bonded to one O(4), one O(5), two equivalent O(6), and two equivalent O(8) atoms to form CoO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, and edges with three equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the fifth Co site, Co(5) is bonded to two equivalent O(10), two equivalent O(7), and two equivalent O(9) atoms to form CoO6 octahedra that share edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with four equivalent Co(3)O6 octahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Co(3) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Fe(1) and two equivalent Co(2) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(3), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(2), and one Co(4) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Li(1), one Fe(1), one Co(2), and one Co(4) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(2), and two equivalent Co(4) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one Co(3), and one Co(5) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(2), and two equivalent Co(4) atoms. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(1), one Co(3), and one Co(5) atom. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(5), and two equivalent Co(3) atoms.
Li2FeCo9O20 crystallizes in the triclinic P-1 space group. Li(1) is bonded to one O(10), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form distorted LiO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-16°. The Li(1)-O(10) bond length is 2.17 Å. The Li(1)-O(3) bond length is 2.19 Å. The Li(1)-O(5) bond length is 2.11 Å. The Li(1)-O(6) bond length is 2.25 Å. The Li(1)-O(8) bond length is 2.22 Å. The Li(1)-O(9) bond length is 2.20 Å. Fe(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, and edges with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles are 16°. Both Fe(1)-O(2) bond lengths are 2.00 Å. Both Fe(1)-O(4) bond lengths are 2.00 Å. Both Fe(1)-O(5) bond lengths are 2.03 Å. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(7), one O(9), two equivalent O(1), and two equivalent O(3) atoms to form CoO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with three equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles are 15°. The Co(1)-O(7) bond length is 1.88 Å. The Co(1)-O(9) bond length is 1.88 Å. There is one shorter (1.88 Å) and one longer (1.91 Å) Co(1)-O(1) bond length. There is one shorter (1.91 Å) and one longer (1.93 Å) Co(1)-O(3) bond length. In the second Co site, Co(2) is bonded to one O(4), one O(5), one O(6), one O(8), and two equivalent O(2) atoms to form CoO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with three equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. The Co(2)-O(4) bond length is 1.87 Å. The Co(2)-O(5) bond length is 1.90 Å. The Co(2)-O(6) bond length is 1.91 Å. The Co(2)-O(8) bond length is 1.93 Å. There is one shorter (1.85 Å) and one longer (1.89 Å) Co(2)-O(2) bond length. In the third Co site, Co(3) is bonded to one O(1), one O(3), one O(7), one O(9), and two equivalent O(10) atoms to form CoO6 octahedra that share corners with two equivalent Li(1)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-14°. The Co(3)-O(1) bond length is 1.89 Å. The Co(3)-O(3) bond length is 1.90 Å. The Co(3)-O(7) bond length is 1.88 Å. The Co(3)-O(9) bond length is 1.94 Å. There is one shorter (1.89 Å) and one longer (1.90 Å) Co(3)-O(10) bond length. In the fourth Co site, Co(4) is bonded to one O(4), one O(5), two equivalent O(6), and two equivalent O(8) atoms to form CoO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, and edges with three equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. The Co(4)-O(4) bond length is 1.85 Å. The Co(4)-O(5) bond length is 1.88 Å. There is one shorter (1.87 Å) and one longer (1.92 Å) Co(4)-O(6) bond length. There is one shorter (1.88 Å) and one longer (1.90 Å) Co(4)-O(8) bond length. In the fifth Co site, Co(5) is bonded to two equivalent O(10), two equivalent O(7), and two equivalent O(9) atoms to form CoO6 octahedra that share edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with four equivalent Co(3)O6 octahedra. Both Co(5)-O(10) bond lengths are 1.91 Å. Both Co(5)-O(7) bond lengths are 1.91 Å. Both Co(5)-O(9) bond lengths are 1.90 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Co(3) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Fe(1) and two equivalent Co(2) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(3), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(2), and one Co(4) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Li(1), one Fe(1), one Co(2), and one Co(4) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(2), and two equivalent Co(4) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one Co(3), and one Co(5) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(2), and two equivalent Co(4) atoms. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(1), one Co(3), and one Co(5) atom. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Li(1), one Co(5), and two equivalent Co(3) atoms.