Materials Data on Li2S2O7 by Materials Project
Li2S2O7 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Li1+ is bonded to five O2- atoms to form LiO5 trigonal bipyramids that share corners with five SO4 tetrahedra and edges with two equivalent LiO5 trigonal bipyramids. There are a spread of Li–O bond distances ranging from 1.99–2.16 Å. There are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share a cornercorner with one SO4 tetrahedra and corners with four equivalent LiO5 trigonal bipyramids. There are a spread of S–O bond distances ranging from 1.45–1.71 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share a cornercorner with one SO4 tetrahedra and corners with six equivalent LiO5 trigonal bipyramids. There is three shorter (1.46 Å) and one longer (1.63 Å) S–O bond length. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Li1+ and one S6+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Li1+ and one S6+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Li1+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Li1+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to two S6+ atoms.