Materials Data on Li2Sn5(PO4)4 by Materials Project
Li2Sn5(PO4)4 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one Li2Sn5(PO4)4 sheet oriented in the (0, 1, 0) direction. Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share a cornercorner with one SnO6 octahedra, corners with four PO4 tetrahedra, and an edgeedge with one SnO6 octahedra. The corner-sharing octahedral tilt angles are 86°. There are a spread of Li–O bond distances ranging from 1.86–2.32 Å. There are three inequivalent Sn2+ sites. In the first Sn2+ site, Sn2+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Sn–O bond distances ranging from 2.20–2.35 Å. In the second Sn2+ site, Sn2+ is bonded to six O2- atoms to form distorted SnO6 octahedra that share corners with two equivalent LiO4 tetrahedra, corners with six PO4 tetrahedra, and edges with two equivalent LiO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.46–2.70 Å. In the third Sn2+ site, Sn2+ is bonded to four O2- atoms to form distorted SnO4 trigonal pyramids that share corners with two PO4 tetrahedra, an edgeedge with one PO4 tetrahedra, and an edgeedge with one SnO4 trigonal pyramid. There are a spread of Sn–O bond distances ranging from 2.16–2.44 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one SnO6 octahedra, corners with two equivalent LiO4 tetrahedra, a cornercorner with one SnO4 trigonal pyramid, and an edgeedge with one SnO4 trigonal pyramid. The corner-sharing octahedral tilt angles are 66°. There are a spread of P–O bond distances ranging from 1.52–1.60 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent SnO6 octahedra, corners with two equivalent LiO4 tetrahedra, and a cornercorner with one SnO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 58–65°. There are a spread of P–O bond distances ranging from 1.54–1.59 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Li1+, two Sn2+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, two Sn2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Li1+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Sn2+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one Sn2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Sn2+ and one P5+ atom.