Materials Data on Li5Sn2 by Materials Project

Abstract

Li5Sn2 crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Li5Sn2 sheets oriented in the (0, 0, 1) direction. there are three inequivalent Li sites. In the first Li site, Li is bonded in a 8-coordinate geometry to eight Li and six equivalent Sn atoms. There are six shorter (2.88 Å) and two longer (2.90 Å) Li–Li bond lengths. All Li–Sn bond lengths are 3.29 Å. In the second Li site, Li is bonded in a distorted trigonal non-coplanar geometry to one Li and three equivalent Sn atoms. All Li–Sn bond lengths are 2.92 Å. In the third Li site, Li is bonded to three equivalent Li and four equivalent Sn atoms to form a mixture of distorted edge, face, and corner-sharing LiLi3Sn4 tetrahedra. There are one shorter (2.77 Å) and three longer (2.87 Å) Li–Sn bond lengths. Sn is bonded in a 7-coordinate geometry to ten Li atoms.