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• W4246138855 endingPage "A6046" @default.
• W4246138855 startingPage "A6039" @default.
• W4246138855 abstract "Many transition metal sulfides are electronically conductive, electrochemically active and reversible in reactions with lithium. However, the application of transition metal sulfides as sulfur cathode additives in lithium-sulfur (Li-S) batteries has not been fully explored. In this study, Pyrite (FeS2) is studied as a capacity contributing conductive additive in sulfur cathode for Li-S batteries. Electrochemically discharging the S-FeS2 composite electrodes to 1.0 V activates the FeS2 component, contributing to the improved Li-S cell discharge energy density. However, direct activation of the FeS2 component in a fresh S-FeS2 cell results in a significant shuttling effect in the subsequent charging process, preventing further cell cycling. The slight FeS2 solubility in electrolyte and its activation alone in S-FeS2 cells are not the root causes of the severe shuttling effect. The observed severe shuttling effect is strongly correlated to the 1st charging of the activated S-FeS2 electrode that promotes iron dissolution in electrolyte and the deposition of electronically conductive FeS on the anode SEI. Pre-cycling of the S-FeS2 cell prior to the FeS2 activation or the use of LiNO3 electrolyte additive help to prevent the severe shuttling effect and allow the cell to cycle between 2.6 V to 1.0 V with an extra capacity contribution from the FeS2 components. However, a more effective method of anode pre-passivation is still needed to fully protect the lithium surface from FeS deposition and allow the S-FeS2 electrode to maintain high energy density over extended cycles. A mechanism explaining the observed phenomena based on the experimental data is proposed and discussed." @default.
• W4246138855 created "2022-05-12" @default.
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• W4246138855 date "2016-09-09" @default.
• W4246138855 modified "2023-10-09" @default.
• W4246138855 title "Interaction of FeS₂and Sulfur in Li-S Battery System" @default.
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• W4246138855 doi "https://doi.org/10.1149/2.0041701jes" @default.
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