Access to M3+/M2+ redox couple in layered LiMS2 sulfides (M = Ti, V, Cr) as Anodes for Li-ion Batteries > Publication | UNIST YK RESEARCH

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Access to M3+/M2+ redox couple in layered LiMS2 sulfides (M = Ti, V, Cr) as Anodes for Li-ion Batteries
Author
Youngsik Kim, Kyu-sung Park, Sang-hoon Song, Jiantao Han, and John B. Goodenough*
Journal
Journal of the Electrochemical Society
Vol
16
Page
A703-A708
Year
2004-2009
The insertion of Li into layered  sulfides has been reinvestigated with ethylene-carbonate-based carbonate electrolytes. The  and  redox couples in a sulfide were found to give a reversible insertion reaction at about 0.5 and 1.0 V vs , respectively, while Cr atoms are displaced from  at 0.9 V vs . 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  before reaching the  redox couple, while an SEI layer was formed after reaching the  redox couple at 1.0 V during the first discharge of the  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.