DOI: 10.17188/1304585
title: Materials Data on Li9(CoO4)2 by Materials Project

description: Li9(CoO4)2 is Aluminum carbonitride-like structured and crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. there are nine inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with two equivalent CoO4 tetrahedra, corners with three LiO4 tetrahedra, corners with five LiO4 trigonal pyramids, an edgeedge with one LiO4 tetrahedra, an edgeedge with one CoO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.93–2.03 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 trigonal pyramids that share corners with two CoO4 tetrahedra, corners with six LiO4 tetrahedra, corners with two LiO4 trigonal pyramids, an edgeedge with one CoO4 tetrahedra, edges with two LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.94–2.16 Å. In the third Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with two LiO4 tetrahedra, corners with four CoO4 tetrahedra, corners with two LiO4 trigonal pyramids, an edgeedge with one LiO4 tetrahedra, and edges with two LiO4 trigonal pyramids. There are a spread of Li–O bond distances ranging from 2.00–2.02 Å. In the fourth Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 trigonal pyramids that share corners with two equivalent CoO4 tetrahedra, corners with five LiO4 tetrahedra, a cornercorner with one LiO4 trigonal pyramid, an edgeedge with one CoO4 tetrahedra, edges with two LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.94–2.19 Å. In the fifth Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with two equivalent CoO4 tetrahedra, corners with three LiO4 tetrahedra, corners with three LiO4 trigonal pyramids, an edgeedge with one CoO4 tetrahedra, edges with two LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.93–2.19 Å. In the sixth Li1+ site, Li1+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Li–O bond distances ranging from 1.97–2.10 Å. In the seventh Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with four LiO4 tetrahedra, corners with four CoO4 tetrahedra, corners with four LiO4 trigonal pyramids, edges with two LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.94–2.03 Å. In the eighth Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with two CoO4 tetrahedra, corners with four LiO4 tetrahedra, corners with four LiO4 trigonal pyramids, an edgeedge with one CoO4 tetrahedra, edges with two LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.94–2.08 Å. In the ninth Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent CoO4 tetrahedra, corners with seven LiO4 tetrahedra, a cornercorner with one LiO4 trigonal pyramid, an edgeedge with one CoO4 tetrahedra, and edges with two LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.91–2.05 Å. There are two inequivalent Co+3.50+ sites. In the first Co+3.50+ site, Co+3.50+ is bonded to four O2- atoms to form CoO4 tetrahedra that share corners with seven LiO4 tetrahedra, corners with three LiO4 trigonal pyramids, an edgeedge with one LiO4 tetrahedra, and edges with two LiO4 trigonal pyramids. There are a spread of Co–O bond distances ranging from 1.79–1.85 Å. In the second Co+3.50+ site, Co+3.50+ is bonded to four O2- atoms to form CoO4 tetrahedra that share corners with seven LiO4 tetrahedra, corners with three LiO4 trigonal pyramids, edges with two LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Co–O bond distances ranging from 1.78–1.94 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to five Li1+ and one Co+3.50+ atom to form distorted OLi5Co octahedra that share corners with two equivalent OLi5Co octahedra, corners with three OLi4Co trigonal bipyramids, edges with four OLi5Co octahedra, and an edgeedge with one OLi4Co trigonal bipyramid. The corner-sharing octahedra tilt angles range from 52–56°. In the second O2- site, O2- is bonded to five Li1+ and one Co+3.50+ atom to form OLi5Co octahedra that share corners with two equivalent OLi5Co octahedra, corners with three OLi4Co trigonal bipyramids, edges with four OLi5Co octahedra, and an edgeedge with one OLi4Co trigonal bipyramid. The corner-sharing octahedra tilt angles range from 52–56°. In the third O2- site, O2- is bonded in a 6-coordinate geometry to five Li1+ and one Co+3.50+ atom. In the fourth O2- site, O2- is bonded to four Li1+ and one Co+3.50+ atom to form distorted OLi4Co trigonal bipyramids that share corners with four OLi5Co octahedra, corners with four OLi4Co trigonal bipyramids, and edges with two OLi4Co trigonal bipyramids. The corner-sharing octahedra tilt angles range from 51–60°. In the fifth O2- site, O2- is bonded to four Li1+ and one Co+3.50+ atom to form distorted OLi4Co trigonal bipyramids that share corners with two equivalent OLi5Co octahedra, corners with two OLi4Co trigonal bipyramids, and edges with four OLi4Co trigonal bipyramids. The corner-sharing octahedra tilt angles range from 55–57°. In the sixth O2- site, O2- is bonded to four Li1+ and one Co+3.50+ atom to form OLi4Co trigonal bipyramids that share corners with two equivalent OLi5Co octahedra, corners with four OLi4Co trigonal bipyramids, and edges with three OLi4Co trigonal bipyramids. The corner-sharing octahedra tilt angles range from 49–61°. In the seventh O2- site, O2- is bonded to four Li1+ and one Co+3.50+ atom to form distorted OLi4Co trigonal bipyramids that share corners with three OLi5Co octahedra, corners with four OLi4Co trigonal bipyramids, edges with three OLi5Co octahedra, and an edgeedge with one OLi4Co trigonal bipyramid. The corner-sharing octahedra tilt angles range from 52–66°. In the eighth O2- site, O2- is bonded to five Li1+ and one Co+3.50+ atom to form distorted OLi5Co octahedra that share corners with five OLi4Co trigonal bipyramids, edges with four OLi5Co octahedra, and an edgeedge with one OLi4Co trigonal bipyramid.