Materials Data on Li2H2SO5 by Materials Project
Li2H2SO5 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with three LiO4 tetrahedra and corners with three equivalent SO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.95–1.98 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with three LiO4 tetrahedra and corners with four equivalent SO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.96–2.01 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with seven LiO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.48–1.50 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Li1+ and one S6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Li1+ and two H1+ atoms. In the third O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Li1+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two Li1+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one Li1+ and one S6+ atom.