期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 8, 页码 1064-1069出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201200696
关键词
lithium-sulfur batteries; cathode materials; electrochemistry; polysulfide shuttle; passivation layer
类别
资金
- U.S. Department of Energy (DOE)/Energy Efficiency and Renewable Energy (EERE)
- Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE
Lithium-sulfur (Li-S) batteries suffer from rapid capacity decay and low energy efficiency because of the low solubility of lithium sulfide (Li2S) in organic solvents and the intrinsic polysulfide shuttle phenomenon. Here, a novel additive, phosphorus pentasulfide (P2S5) in organic electrolyte, is reported to boost the cycling performance of Li-S batteries. The function of the additive is two-fold: 1) P2S5 promotes the dissolution of Li2S and alleviates the loss of capacity caused by the precipitation of Li2S and 2) P2S5 passivates the surface of lithium metal and therefore eliminates the polysulfide shuttle phenomenon. A Li-S test cell demonstrates a high reversible capacity of 9001350 mAh g1 and a high coulombic efficiency of 90% for at least 40 stable cycles at 0.1 C.
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