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Fast Lithium Ion Conduction in Li2SnS3: Synthesis,
Physicochemical Characterization, and Electronic Structure
Jacilynn A. Brant, Danielle M. Massi, N. A. W. Holzwarth,
Joseph H. MacNeil, Alexios P. Douvalis, Thomas Bakas, Steve
W. Martin, Michael D. Gross, and Jennifer A. Aitken,
Chemistry of Materials 27, 189-196 (2015)
local copy
supplementary materials
Li2SnS3 is a fast Li+ ion conductor that exhibits
high thermal
stability (mp ∼750 °C) as well as environmental stability under ambient
conditions. Polycrystalline Li2SnS3 was synthesized
using high-temperature,
solid-state synthesis. According to single-crystal X-ray diffraction,
Li2SnS3 has a
sodium chloride-like structure (space group C2/c), a result supported by
synchrotron X-ray powder diffraction and 119Sn Mössbauer
spectroscopy.
According to impedance spectroscopy, Li2SnS3
exhibits Li+ ion conductivity up
to 1.6 × 10−3 S/cm at 100 °C, which is among the highest
for ternary
chalcogenides. First-principles simulations of Li2SnS3
and the oxide analogue,
Li2SnO3, provide insight into the basic properties
and mechanisms of the ionic
conduction. The high thermal stability, significant lithium ion
conductivity, and environmental stability make Li2SnS3
a promising new solid-state electrolyte
for lithium ion batteries.