Abstract

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+ / Li0, respectively, while Cr atoms are displaced from LiCrS2 at 0.9 V vs Li+ / Li0. 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+x VS2 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.

Keywords

RedoxElectrolyteAnodePassivationSulfideInorganic chemistryChemistryEthylene carbonateCarbonateBattery (electricity)GraphiteElectrodeLayer (electronics)Physical chemistryOrganic chemistry

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Publication Info

Year
2009
Type
article
Volume
156
Issue
8
Pages
A703-A703
Citations
51
Access
Closed

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Youngsik Kim, Kyusung Park, Sang Hoon Song et al. (2009). Access to M[sup 3+]/M[sup 2+] Redox Couples in Layered LiMS[sub 2] Sulfides (M=Ti, V, Cr) as Anodes for Li-Ion Battery. Journal of The Electrochemical Society , 156 (8) , A703-A703. https://doi.org/10.1149/1.3151856

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DOI
10.1149/1.3151856