Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes
Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes
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用于提高锂金属负极循环稳定性的浓缩双盐电解质
DOI：
10.1088/1674-1056/25/7/078203
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发表时间：
2016
影响因子：
1.7
通讯作者：
Chen Li-Quan
中科院分区：
文献类型：
--
作者：
Liu Pin;Ma Qiang;Fang Zheng;Ma Jie;Hu Yong-Sheng;Zhou Zhi-Bin;Li Hong;Huang Xue-Jie;Chen Li-Quan
锂（Li）金属是可充电锂电池的理想阳极材料，这是由于其高理论比容量（3860 mAh/g）、低密度（0.534 g/cm 3）和低负电化学电势（− 3.040 V vs.标准氢电极）。本文研究了由Li [N（SO 2F）2]（LiFSI）和Li [N（SO2 CF 3）2]（LiTFSI）组成的二元盐浓电解质。在此双盐体系中，在Li中100次循环后容量保持率甚至可以保持在95.7|磷酸铁锂电池。的Li|锂电池在0.5mA/cm 2电流密度下可循环600 h以上，|铜电池在0.5mA/cm 2电流下循环2 0 0次以上，平均库仑效率高达99%。这些结果表明，浓缩的双盐电解质具有上级的电化学性能，将是一个有前途的候选人，应用于可充电锂电池。
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/cm 3), 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 (SO 2 F) 2](LiFSI) and Li [N (SO 2 CF 3) 2](LiTFSI) were studied. In this dual-salt system, the capacity retention can even be maintained at 95.7% after 100 cycles in Li| LiFePO 4 cells. A Li| Li cell can be cycled at 0.5 mA/cm 2 for more than 600 h, and a Li| Cu cell can be cycled at 0.5 mA/cm 2 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.