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Chin. Phys. B, 2016, Vol. 25(7): 078203    DOI: 10.1088/1674-1056/25/7/078203
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Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes

Pin Liu(刘品)1, Qiang Ma(马强)1,2, Zheng Fang(方铮)1, Jie Ma(马洁)1, Yong-Sheng Hu(胡勇胜)1, Zhi-Bin Zhou(周志彬)2, Hong Li(李泓)1, Xue-Jie Huang(黄学杰)1, Li-Quan Chen(陈立泉)1
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 Key laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract  

Lithium (Li) metal is an ideal anode material for rechargeable Li batteries, due to its high theoretical specific capacity (3860 mAh/g), low density (0.534 g/cm3), and low negative electrochemical potential (-3.040 V vs. standard hydrogen electrode). In this work, the concentrated electrolytes with dual salts, composed of Li[N(SO2F)2] (LiFSI) and Li[N(SO2CF3)2] (LiTFSI) were studied. In this dual-salt system, the capacity retention can even be maintained at 95.7% after 100 cycles in Li|LiFePO4 cells. A Li|Li cell can be cycled at 0.5 mA/cm2 for more than 600 h, and a Li|Cu cell can be cycled at 0.5 mA/cm2 for more than 200 cycles with a high average Coulombi efficiency of 99%. These results show that the concentrated dual-salt electrolytes exhibit superior electrochemical performance and would be a promising candidate for application in rechargeable Li batteries.

Keywords:  lithium metal rechargeable batteries      dual-salt electrolyte      concentrated electrolytes  
Received:  21 March 2016      Published:  05 July 2016
PACS:  82.47.Aa (Lithium-ion batteries)  
  65.40.gk (Electrochemical properties)  
  82.45.Fk (Electrodes)  
Fund: 

Project supported by the National Nature Science Foundation of China (Grant Nos. 51222210, 51472268, 51421002, and 11234013) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09010300).

Corresponding Authors:  Yong-Sheng Hu     E-mail:  yshu@iphy.ac.cn

Cite this article: 

Pin Liu(刘品), Qiang Ma(马强), Zheng Fang(方铮), Jie Ma(马洁), Yong-Sheng Hu(胡勇胜), Zhi-Bin Zhou(周志彬), Hong Li(李泓), Xue-Jie Huang(黄学杰), Li-Quan Chen(陈立泉) Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes 2016 Chin. Phys. B 25 078203

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