多硫化物
法拉第效率
溶解
材料科学
溶解度
电解质
硫黄
无机化学
化学工程
容量损失
锂(药物)
锂硫电池
硫化物
化学
有机化学
冶金
电极
物理化学
内分泌学
工程类
医学
作者
Zhan Lin,Zengcai Liu,Wujun Fu,Nancy J. Dudney,Chengdu Liang
标识
DOI:10.1002/adfm.201200696
摘要
Abstract Lithium‐sulfur (Li‐S) batteries suffer from rapid capacity decay and low energy efficiency because of the low solubility of lithium sulfide (Li 2 S) in organic solvents and the intrinsic polysulfide shuttle phenomenon. Here, a novel additive, phosphorus pentasulfide (P 2 S 5 ) in organic electrolyte, is reported to boost the cycling performance of Li‐S batteries. The function of the additive is two‐fold: 1) P 2 S 5 promotes the dissolution of Li 2 S and alleviates the loss of capacity caused by the precipitation of Li 2 S and 2) P 2 S 5 passivates the surface of lithium metal and therefore eliminates the polysulfide shuttle phenomenon. A Li‐S test cell demonstrates a high reversible capacity of 900–1350 mAh g −1 and a high coulombic efficiency of ≥90% for at least 40 stable cycles at 0.1 C.
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