期刊
JOURNAL OF POWER SOURCES
卷 236, 期 -, 页码 181-187出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.02.072
关键词
Solid electrolyte interphase; Lithium electrode; Polysulfides; Lithium sulfide; Lithium-sulfur batteries
资金
- aid program for the Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
The solid electrolyte interphase on the lithium electrode cycled with an electrolyte solution with polysulfides is investigated by a series of measurement within symmetrical cells. Both discharge-charge curves and EIS (electrochemical impedance spectroscopy) data show that polysulfides in the electrolyte solution play an important role for the stability of the interface on the lithium electrode. These results combined with SEM (scanning electron microscope) images show that the decomposition of the lithium salt (LiTFSI) on the lithium electrode can be prevented by a surface film formed with polysulfides. As shown by XPS (X-ray photoelectron spectroscopy) spectra and depth profiling, the surface film on the lithium anode cycled in the electrolyte solution with polysulfides can be assumed to be composed of two layers. The top layer is composed of the products of the decomposition of LiTFSI and the bottom layer is composed of lithium sulfide produced by the reaction between lithium metal and the polysulfides in the electrolyte solution. We suggest that the bottom layer efficiently prevents the decomposition of the lithium salt on the lithium anode in lithium-sulfur batteries, thereby increasing the stability and cyclability. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据