Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 156, Issue 8, Pages A703-A708Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3151856
Keywords
association; chromium compounds; electrochemical electrodes; electrolytes; lithium compounds; oxidation; passivation; reduction (chemical); secondary cells; titanium compounds; vanadium compounds
Funding
- Office of FreedomCAR
- U.S. Department of Energy [DE-AC03-76SF00098]
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The insertion of Li into layered LiMS2 (M=Ti, V, Cr) sulfides has been reinvestigated with ethylene-carbonate-based carbonate electrolytes. The Ti3+/Ti2+ and V3+/V2+ redox couples in a sulfide were found to give a reversible insertion reaction at about 0.5 and 1.0 V vs Li+/Li-0, respectively, while Cr atoms are displaced from LiCrS2 at 0.9 V vs Li+/Li-0. Comparison to a graphite anode indicates that a solid-electrolyte-interface (SEI) passivation layer is formed below 0.9 V during the first discharge of the LiTiS2 before reaching the Ti3+/Ti2+ redox couple, while an SEI layer was formed after reaching the V3+/V2+ redox couple at 1.0 V during the first discharge of the Li1+xVS2 electrode. The formation of a suitable SEI layer and therefore the reversibility and capacity of sulfide anodes are shown to depend on the composition of the electrolyte.
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