Abstract
For an attempt to improve the cycle capability of the Li8FeS5 cells, we have prepared LiI-doped Li8FeS5 composite positive electrode materials. The obtained Li8FeS5·xLiI sample cells showed the improved cycle capability, though the initial capacity value decreased with proportional to the mass of LiI. The improved cycle performance was attributable to the suppressed resistance rise of the cells, due probably to the suppression of high-resistive surface precipitates formed by the reaction between the active material and the electrolyte. The dopant LiI would stabilize the local structure against Li extraction/insertion reactions, as well as suppress the reaction with the electrolyte, leading to the improved cycle performance.
Highlights
For an attempt to improve the cycle capability of the Li8 FeS5 cells, we have prepared LiI-doped Li8 FeS5 composite positive electrode materials
The SPS-treated 4Li2 S + FeS blended powder was grayish black in color,[12] and it changed to a black powder after the addition of
Rca component would be associated with the surface precipitates on the cathode, possibly consisted of high-resistive organosulfur compounds formed by the reaction between the active materials and electrolyte, and is responsible for the cycle degradation of the cells; less amounts of surface precipitates in the Li/Li8 FeS5 · 0.5LiI cell showed improved cycle capability with suppressed resistance rise
Summary
For an attempt to improve the cycle capability of the Li8 FeS5 cells, we have prepared LiI-doped Li8 FeS5 composite positive electrode materials. The obtained Li8 FeS5 · xLiI sample cells showed the improved cycle capability, though the initial capacity value decreased with proportional to the mass of LiI.
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