分离器(采油)
电化学
硫黄
多硫化物
锂硫电池
化学工程
化学
电化学动力学
动力学
氧化还原
材料科学
无机化学
电极
有机化学
电解质
物理化学
热力学
物理
工程类
量子力学
作者
Dongming Xie,Xiaoxi Zuo,Zhuoying Su,Tianming Zhu,Shuang Liu,Xin Xiao,Junmin Nan
标识
DOI:10.1002/ente.202101142
摘要
Lithium–sulfur batteries receive widespread attention in the past decade as a result of their high theoretical specific capacity. However, the shuttle effect of soluble polysulfides produced in the battery cycle can result in low sulfur utilization and slow reaction kinetics, which seriously hinders its practical application. Herein, a carrageenan (CG)–acetylene black (AB)-modified separator for long-life Li–S batteries is proposed. The batteries with modified separator exhibit excellent electrochemical performance, fast redox kinetics (733 mAh g−1 at 6 C), and a low-capacity decay of 0.042% per cycle at 2 C. More importantly, a high reversible capacity of 805 mAh g−1 can be obtained at a high sulfur loading of 3.2 mg cm−2. The performance improvement of the separator can be attributed to the outstanding adsorbing polysulfides ability of CG and the better conductivity of AB. Combined with the natural source of CG, simple preparation process, and excellent electrochemical performance, our research results provide a kind of Li–S batteries promising modification idea.
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