Suppressing the dissolution of polysulfides with cosolvent fluorinated diether towards high-performance lithium sulfur batteries

被引：63

作者：

Gu, Sui ^{[1
,2
,3
]}

Qian, Rong ^{[2
]}

Jin, Jun ^{[1
]}

Wang, Qingsong ^{[1
,3
]}

Guo, Jing ^{[1
,3
]}

Zhang, Sanpei ^{[1
,3
]}

Zhuo, Shangjun ^{[2
]}

Wen, Zhaoyin ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Ceram, Natl Ctr Inorgan Mass Spectrometry Shanghai, Shanghai 200050, Peoples R China

[3] Chinese Acad Sci, Grad Sch, Shanghai 200050, Peoples R China

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2016年 / 18卷 / 42期

基金：

中国国家自然科学基金;

关键词：

LI-S BATTERIES; IONIC LIQUIDS; ELECTROLYTE; CATHODE; ETHER; CAPACITY; STABILITY; COMPOSITE; MEDIA; XPS;

D O I：

10.1039/c6cp04775k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dissolution and shuttle of polysulfides in electrolytes cause severe anode corrosion, low coulombic efficiency, and a rapid fading of the capacity of lithium-sulfur batteries. Fluorinated diether (FDE) was selected as a cosolvent in traditional ether electrolytes to suppress the dissolution of polysulfides. The modified electrolytes lead to a negligible solubility of polysulfides, as well as decreased corrosion of the lithium anode. In an optimal system, the cells show improved cycling performance with an average coulombic efficiency of above 99% and a highly stable reversible discharge capacity of 701 mA h g(-1) after 200 cycles at a 0.5C rate. A combination of electrochemical studies and X-ray photoelectron spectroscopy demonstrates the sulfur reduction mechanism with three voltage plateaus.

引用

页码：29293 / 29299

页数：7

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