Electrochemical Evolution of an Iron Sulfide and Sulfur Based Cathode for All-Solid-State Li-Ion Batteries

In this study we demonstrate an all-solid-state electrode with a maximum specific energy of 928 Wh kg−1. A mechanochemically prepared composite of FeS and S is used as the cathode active material. Capacity in excess of theoretical for the active material is attributed to the partial electrochemical...

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Bibliographic Details
Published inJournal of the Electrochemical Society Vol. 160; no. 8; pp. A1009 - A1015
Main Authors Yersak, Thomas A., Stoldt, Conrad, Lee, Se-Hee
Format Journal Article
LanguageEnglish
Published The Electrochemical Society 01.01.2013
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Summary:In this study we demonstrate an all-solid-state electrode with a maximum specific energy of 928 Wh kg−1. A mechanochemically prepared composite of FeS and S is used as the cathode active material. Capacity in excess of theoretical for the active material is attributed to the partial electrochemical utilization of the Li2S component of the 77.5Li2S:22.5P2S5 glass electrolyte in the composite electrode. This electrode exhibits a complex evolving electrochemistry that can be approximated by the combination of the parallel electrochemistries of FeS, FeS2, and S. Using dQ/dV analysis we present indirect evidence for the electrochemical in-situ formation of a FeS2 phase during charging.
Bibliography:002308JES
ISSN:0013-4651
1945-7111
DOI:10.1149/2.002308jes