DOE OSTI2020
Li22(Cu3Si2)7 crystallizes in the trigonal P3_1 space group. The structure is three-dimensional. there are twenty-two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 1-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.56–2.76 Å. In the second Li1+ site, Li1+ is bonded in a 3-coordinate geometry to three Cu+1.24+ and three Si+3.43- atoms. There are a spread of Li–Cu bond distances ranging from 2.53–2.57 Å. There are one shorter (2.58 Å) and two longer (2.62 Å) Li–Si bond lengths. In the third Li1+ site, Li1+ is bonded in a 1-coordinate geometry to three Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.71–2.88 Å. In the fourth Li1+ site, Li1+ is bonded to four Si+3.43- atoms to form a mixture of distorted edge and corner-sharing LiSi4 trigonal pyramids. There are a spread of Li–Si bond distances ranging from 2.79–2.88 Å. In the fifth Li1+ site, Li1+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.70–3.06 Å. In the sixth Li1+ site, Li1+ is bonded in a 3-coordinate geometry to three Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.76–2.82 Å. In the seventh Li1+ site, Li1+ is bonded in a 5-coordinate geometry to five Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.74–3.06 Å. In the eighth Li1+ site, Li1+ is bonded to four Si+3.43- atoms to form a mixture of distorted edge, corner, and face-sharing LiSi4 trigonal pyramids. There are a spread of Li–Si bond distances ranging from 2.76–2.85 Å. In the ninth Li1+ site, Li1+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.75–2.96 Å. In the tenth Li1+ site, Li1+ is bonded in a distorted rectangular see-saw-like geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.76–2.88 Å. In the eleventh Li1+ site, Li1+ is bonded in a 1-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.79–2.97 Å. In the twelfth Li1+ site, Li1+ is bonded in a 4-coordinate geometry to five Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.69–3.08 Å. In the thirteenth Li1+ site, Li1+ is bonded to four Si+3.43- atoms to form distorted corner-sharing LiSi4 trigonal pyramids. There are a spread of Li–Si bond distances ranging from 2.74–2.85 Å. In the fourteenth Li1+ site, Li1+ is bonded in a distorted rectangular see-saw-like geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.79–2.91 Å. In the fifteenth Li1+ site, Li1+ is bonded in a 5-coordinate geometry to five Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.69–2.95 Å. In the sixteenth Li1+ site, Li1+ is bonded to four Si+3.43- atoms to form a mixture of distorted edge, corner, and face-sharing LiSi4 trigonal pyramids. There are a spread of Li–Si bond distances ranging from 2.81–2.92 Å. In the seventeenth Li1+ site, Li1+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.77–2.97 Å. In the eighteenth Li1+ site, Li1+ is bonded in a 3-coordinate geometry to three Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.67–2.82 Å. In the nineteenth Li1+ site, Li1+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.74–2.97 Å. In the twentieth Li1+ site, Li1+ is bonded in a 3-coordinate geometry to two Cu+1.24+ and three Si+3.43- atoms. There are one shorter (2.52 Å) and one longer (2.55 Å) Li–Cu bond lengths. There are a spread of Li–Si bond distances ranging from 2.62–2.68 Å. In the twenty-first Li1+ site, Li1+ is bonded in a distorted rectangular see-saw-like geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.78–2.87 Å. In the twenty-second Li1+ site, Li1+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Li–Si bond distances ranging from 2.57–2.71 Å. There are twenty-one inequivalent Cu+1.24+ sites. In the first Cu+1.24+ site, Cu+1.24+ is bonded in a 4-coordinate geometry to one Li1+ and three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.32–2.38 Å. In the second Cu+1.24+ site, Cu+1.24+ is bonded in a 1-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.36–2.50 Å. In the third Cu+1.24+ site, Cu+1.24+ is bonded in a 3-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.43–2.50 Å. In the fourth Cu+1.24+ site, Cu+1.24+ is bonded in a 2-coordinate geometry to two Si+3.43- atoms. There are one shorter (2.36 Å) and one longer (2.42 Å) Cu–Si bond lengths. In the fifth Cu+1.24+ site, Cu+1.24+ is bonded in a 6-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.32–2.43 Å. In the sixth Cu+1.24+ site, Cu+1.24+ is bonded in a 4-coordinate geometry to one Li1+ and three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.34–2.47 Å. In the seventh Cu+1.24+ site, Cu+1.24+ is bonded in a 6-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.35–2.47 Å. In the eighth Cu+1.24+ site, Cu+1.24+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.32–2.49 Å. In the ninth Cu+1.24+ site, Cu+1.24+ is bonded in a 3-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.33–2.37 Å. In the tenth Cu+1.24+ site, Cu+1.24+ is bonded in a 1-coordinate geometry to four Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.34–2.49 Å. In the eleventh Cu+1.24+ site, Cu+1.24+ is bonded in a 1-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.31–2.51 Å. In the twelfth Cu+1.24+ site, Cu+1.24+ is bonded in a 4-coordinate geometry to three Si+3.43- atoms. There are one shorter (2.37 Å) and two longer (2.43 Å) Cu–Si bond lengths. In the thirteenth Cu+1.24+ site, Cu+1.24+ is bonded in a 2-coordinate geometry to two Si+3.43- atoms. There are one shorter (2.38 Å) and one longer (2.39 Å) Cu–Si bond lengths. In the fourteenth Cu+1.24+ site, Cu+1.24+ is bonded in a 3-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.29–2.43 Å. In the fifteenth Cu+1.24+ site, Cu+1.24+ is bonded in a 1-coordinate geometry to three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.38–2.56 Å. In the sixteenth Cu+1.24+ site, Cu+1.24+ is bonded in a 6-coordinate geometry to one Li1+ and three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.35–2.45 Å. In the seventeenth Cu+1.24+ site, Cu+1.24+ is bonded in a 2-coordinate geometry to two Si+3.43- atoms. There are one shorter (2.35 Å) and one longer (2.39 Å) Cu–Si bond lengths. In the eighteenth Cu+1.24+ site, Cu+1.24+ is bonded in a 6-coordinate geometry to two Li1+ and three Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.34–2.47 Å. In the nineteenth Cu+1.24+ site, Cu+1.24+ is bonded in a 1-coordinate geometry to three Si+3.43- atoms. There are one shorter (2.36 Å) and two longer (2.44 Å) Cu–Si bond lengths. In the twentieth Cu+1.24+ site, Cu+1.24+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.30–2.55 Å. In the twenty-first Cu+1.24+ site, Cu+1.24+ is bonded in a 4-coordinate geometry to four Si+3.43- atoms. There are a spread of Cu–Si bond distances ranging from 2.35–2.48 Å. There are fourteen inequivalent Si+3.43- sites. In the first Si+3.43- site, Si+3.43- is bonded to six Li1+ and six Cu+1.24+ atoms to form SiLi6Cu6 cuboctahedra that share corners with four SiLi7Cu5 cuboctahedra and faces with seven SiLi7Cu4Si cuboctahedra. In the second Si+3.43- site, Si+3.43- is bonded in a 2-coordinate geometry to five Li1+, two Cu+1.24+, and three Si+3.43- atoms. There are a spread of Si–Si bond distances ranging from 2.65–2.71 Å. In the third Si+3.43- site, Si+3.43- is bonded in a 12-coordinate geometry to six Li1+, five Cu+1.24+, and one Si+3.43- atom. The Si–Si bond length is 2.73 Å. In the fourth Si+3.43- site, Si+3.43- is bonded to seven Li1+, four Cu+1.24+, and one Si+3.43- atom to form distorted SiLi7Cu4Si cuboctahedra that share corners with two SiLi6Cu6 cuboctahedra, edges with two equivalent SiLi7Cu4Si cuboctahedra, and faces with six SiLi6Cu6 cuboctahedra. The Si–Si bond length is 2.65 Å. In the fifth Si+3.43- site, Si+3.43- is bonded to six Li1+ and six Cu+1.24+ atoms to form distorted SiLi6Cu6 cuboctahedra that share corners with four SiLi7Cu4Si cuboctahedra, an edgeedge with one SiLi6Cu5Si cuboctahedra, and faces with four SiLi6Cu6 cuboctahedra. In the sixth Si+3.43- site, Si+3.43- is bonded in a 2-coordinate geometry to three Li1+, two Cu+1.24+, and three Si+3.43- atoms. The Si–Si bond length is 2.74 Å. In the seventh Si+3.43- site, Si+3.43- is bonded to five Li1+, six Cu+1.24+, and one Si+3.43- atom to form distorted SiLi5Cu6Si cuboctahedra that share corners with three SiLi7Cu5 cuboctahedra, an edgeedge with one SiLi7Cu5 cuboctahedra, and faces with four SiLi6Cu6 cuboctahedra. In the eighth Si+3.43- site, Si+3.43- is bonded to seven Li1+ and five Cu+1.24+ atoms to form distorted SiLi7Cu5 cuboctahedra that share corners with five SiLi6Cu6 cuboctahedra and faces with five SiLi7Cu5 cuboctahedra. In the ninth Si+3.43- site, Si+3.43- is bonded to six Li1+, five Cu+1.24+, and one Si+3.43- atom to form a mixture of distorted edge, corner, and face-sharing SiLi6Cu5Si cuboctahedra. In the tenth Si+3.43- site, Si+3.43- is bonded to seven Li1+ and five Cu+1.24+ atoms to form distorted SiLi7Cu5 cuboctahedra that share a cornercorner with one SiLi6Cu6 cuboctahedra, edges with two SiLi7Cu5 cuboctahedra, and faces with four SiLi6Cu6 cuboctahedra. In the eleventh Si+3.43- site, Si+3.43- is bonded to eight Li1+ and four Cu+1.24+ atoms to form distorted SiLi8Cu4 cuboctahedra that share corners with two SiLi6Cu6 cuboctahedra, edges with two equivalent SiLi8Cu4 cuboctahedra, and faces with six SiLi6Cu6 cuboctahedra. In the twelfth Si+3.43- site, Si+3.43- is bonded in a 12-coordinate geometry to six Li1+, five Cu+1.24+, and one Si+3.43- atom. In the thirteenth Si+3.43- site, Si+3.43- is bonded in a 12-coordinate geometry to seven Li1+, four Cu+1.24+, and one Si+3.43- atom. In the fourteenth Si+3.43- site, Si+3.43- is bonded to seven Li1+ and five Cu+1.24+ atoms to form SiLi7Cu5 cuboctahedra that share corners with three SiLi6Cu6 cuboctahedra, an edgeedge with one SiLi7Cu5 cuboctahedra, and faces with four SiLi6Cu6 cuboctahedra.