多硫化物
硫黄
电池(电)
阴极
原位
吸附
锂硫电池
光谱学
化学
无机化学
材料科学
化学工程
电化学
电极
有机化学
物理化学
电解质
工程类
物理
功率(物理)
量子力学
作者
Ravindra Kumar Bhardwaj,Yu. L. Mikhlin,David Zitoun
标识
DOI:10.1002/ente.202400421
摘要
The performance of lithium–sulfur (Li–S) rechargeable batteries is strongly dependent on the entrapment of the higher‐order intermediate polysulfides at the sulfur cathode. An attracting way of preventing the polysulfide shuttle is by introducing a polar host which can form a Lewis acid–base complex with polysulfides. Herein, the Li–S battery by incorporating iron sulfides (FeS 2 ) as a polar Lewis acid to entrap higher‐order polysulfides at the cathode center is investigated. FeS 2 /S cathode demonstrates largely improved retention of capacity compared to C/S cathode (capacity fading per cycle of 0.12% and 0.80% for FeS 2 /S and C/S respectively) and good rate performance in Li–S batteries compared to conventional carbon–sulfur (C/S) cathode. This is attributed to the decrease in polysulfide dissolution and better retention of active sulfur in the cathode during battery cycling which is due to the polar FeS 2 additive that well anchors polysulfides. The effect of FeS 2 in preventing the shuttle mechanism is demonstrated by ex situ UV–vis spectroscopy and ex situ Raman spectroscopy studies.
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