DOI: 10.17188/1688149
title: Materials Data on Li4Ti2Co7O18 by Materials Project

description: Li4Ti2Co7O18 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 4-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 2.01–2.62 Å. In the second Li1+ site, Li1+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Li–O bond distances ranging from 2.19–2.60 Å. In the third Li1+ site, Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 2.18–2.26 Å. In the fourth Li1+ site, Li1+ is bonded in a 4-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 2.05–2.61 Å. In the fifth Li1+ site, Li1+ is bonded to five O2- atoms to form distorted LiO5 trigonal bipyramids that share corners with two equivalent CoO6 octahedra, corners with three TiO6 octahedra, an edgeedge with one TiO6 octahedra, edges with three CoO6 octahedra, and edges with two equivalent LiO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 12–79°. There are a spread of Li–O bond distances ranging from 2.01–2.39 Å. In the sixth Li1+ site, Li1+ is bonded in a 5-coordinate geometry to eight O2- atoms. There are a spread of Li–O bond distances ranging from 2.20–2.76 Å. In the seventh Li1+ site, Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 2.15–2.36 Å. In the eighth Li1+ site, Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 2.02–2.56 Å. There are four inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent CoO6 octahedra, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are a spread of Ti–O bond distances ranging from 1.86–2.09 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent CoO6 octahedra, corners with two equivalent LiO5 trigonal bipyramids, edges with two equivalent TiO6 octahedra, edges with two equivalent CoO6 octahedra, and an edgeedge with one LiO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 50°. There are a spread of Ti–O bond distances ranging from 1.91–2.07 Å. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent CoO6 octahedra, a cornercorner with one LiO5 trigonal bipyramid, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are a spread of Ti–O bond distances ranging from 1.87–2.09 Å. In the fourth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent CoO6 octahedra, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are a spread of Ti–O bond distances ranging from 1.86–2.10 Å. There are fourteen inequivalent Co+3.43+ sites. In the first Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with two equivalent LiO5 trigonal bipyramids, edges with six CoO6 octahedra, and an edgeedge with one LiO5 trigonal bipyramid. There are a spread of Co–O bond distances ranging from 1.89–2.05 Å. In the second Co+3.43+ site, Co+3.43+ is bonded to five O2- atoms to form CoO5 square pyramids that share corners with six CoO6 octahedra and edges with two equivalent CoO5 square pyramids. The corner-sharing octahedra tilt angles range from 52–66°. There are a spread of Co–O bond distances ranging from 1.91–2.01 Å. In the third Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with two equivalent CoO5 square pyramids, and edges with four CoO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Co–O bond distances ranging from 1.86–1.91 Å. In the fourth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO5 square pyramids, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.85–1.92 Å. In the fifth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO5 square pyramids, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. There is one shorter (1.89 Å) and five longer (1.90 Å) Co–O bond length. In the sixth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with two equivalent CoO5 square pyramids, and edges with four CoO6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are a spread of Co–O bond distances ranging from 1.90–2.04 Å. In the seventh Co+3.43+ site, Co+3.43+ is bonded to five O2- atoms to form distorted CoO5 square pyramids that share corners with six CoO6 octahedra and edges with two equivalent CoO5 square pyramids. The corner-sharing octahedra tilt angles range from 54–71°. There are a spread of Co–O bond distances ranging from 1.92–2.06 Å. In the eighth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form edge-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.77–2.03 Å. In the ninth Co+3.43+ site, Co+3.43+ is bonded to five O2- atoms to form distorted CoO5 square pyramids that share corners with six CoO6 octahedra and edges with two equivalent CoO5 square pyramids. The corner-sharing octahedra tilt angles range from 53–70°. There are a spread of Co–O bond distances ranging from 1.90–2.00 Å. In the tenth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with two equivalent CoO5 square pyramids, and edges with four CoO6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are a spread of Co–O bond distances ranging from 1.89–2.02 Å. In the eleventh Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO5 square pyramids, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.87–1.92 Å. In the twelfth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO5 square pyramids, edges with two equivalent TiO6 octahedra, and edges with two equivalent CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.89–1.91 Å. In the thirteenth Co+3.43+ site, Co+3.43+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with two equivalent CoO5 square pyramids, edges with four CoO6 octahedra, and edges with two equivalent LiO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 48°. There are a spread of Co–O bond distances ranging from 1.96–2.09 Å. In the fourteenth Co+3.43+ site, Co+3.43+ is bonded to five O2- atoms to form CoO5 square pyramids that share corners with six CoO6 octahedra and edges with two equivalent CoO5 square pyramids. The corner-sharing octahedra tilt angles range from 51–65°. There are a spread of Co–O bond distances ranging from 1.93–2.05 Å. There are thirty-six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to three Co+3.43+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to three Co+3.43+ atoms. In the third O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Li1+ and two equivalent Ti4+ atoms. In the fourth O2- site, O2- is bonded to two equivalent Li1+, two equivalent Ti4+, and one Co+3.43+ atom to form distorted OLi2Ti2Co trigonal bipyramids that share corners with two equivalent OLi2Co3 trigonal pyramids and edges with two equivalent OLi2Ti2Co trigonal bipyramids. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to three Co+3.43+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to one Li1+ and three Co+3.43+ atoms. In the seventh O2- site, O2- is bonded to two equivalent Li1+ and three Co+3.43+ atoms to form a mixture of distorted edge and corner-sharing OLi2Co3 trigonal bipyramids. In the eighth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Li1+ and three Co+3.43+ atoms. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to one Ti4+ and two equivalent Co+3.43+ atoms. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to one Li1+, one Ti4+, and two equivalent Co+3.43+ atoms. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to one Li1+, one Ti4+, and two equivalent Co+3.43+ atoms. In the twelfth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ti4+ and two equivalent Co+3.43+ atoms. In the thirteenth O2- site, O2- is bonded to two equivalent Li1+ and three Co+3.43+ atoms to form distorted OLi2Co3 trigonal bipyramids that share corners with three OLi2Ti2Co trigonal bipyramids, corners with two equivalent OLiCo3 trigonal pyramids, and edges with three OLi2Ti2Co trigonal bipyramids. In the fourteenth O2- site, O2- is bonded to two equivalent Li1+ and three Co+3.43+ atoms to form a mixture of distorted edge and corner-sharing OLi2Co3 trigonal bipyramids. In the fifteenth O2- site, O2- is bonded to two Li1+ and three Co+3.43+ atoms to form distorted OLi2Co3 trigonal pyramids that share corners with two equivalent OLi2Ti2Co trigonal bipyramids, corners with two equivalent OLi2Co3 trigonal pyramids, and edges with two equivalent OLi2Ti2Co trigonal bipyramids. In the sixteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Co+3.43+ atoms. In the seventeenth O2- site, O2- is bonded to two equivalent Li1+, two equivalent Ti4+, and one Co+3.43+ atom to form distorted OLi2Ti2Co trigonal bipyramids that share corners with two equivalent OLi2Co3 trigonal bipyramids, corners with two equivalent OLiCo3 trigonal pyramids, and edges with three OLi2Co3 trigonal bipyramids. In the eighteenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Li1+ and two equivalent Ti4+ atoms. In the nineteenth O2- site, O2- is bonded in a 3-coordinate geometry to three Co+3.43+ atoms. In the twentieth O2- site, O2- is bonded in a 3-coordinate geometry to three Co+3.43+ atoms. In the twenty-first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li1+ and two equivalent Ti4+ atoms. In the twenty-second O2- site, O2- is bonded to two equivalent Li1+, two equivalent Ti4+, and one Co+3.43+ atom to form distorted OLi2Ti2Co trigonal bipyramids that share edges with two equivalent OLi2Ti2Co trigonal bipyramids and edges with two equivalent OLi2Co3 trigonal pyramids. In the twenty-third O2- site, O2- is bonded in a distorted trigonal planar geometry to three Co+3.43+ atoms. In the twenty-fourth O2- site, O2- is bonded to one Li1+ and three Co+3.43+ atoms to form distorted OLiCo3 trigonal pyramids that share corners with six OLi2Co3 trigonal bipyramids and corners with two equivalent OLiCo3 trigonal pyramids. In the twenty-fifth O2- site, O2- is bonded to two equivalent Li1+ and three Co+3.43+ atoms to form a mixture of distorted edge and corner-sharing OLi2Co3 trigonal bipyramids. In the twenty-sixth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Li1+ and three Co+3.43+ atoms. In the twenty-seventh O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+ and two equivalent Co+3.43+ at