中国物理B ›› 2016, Vol. 25 ›› Issue (7): 78203-078203.doi: 10.1088/1674-1056/25/7/078203
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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)
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
摘要:
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.
中图分类号: (Lithium-ion batteries)