Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes

Pin Liu; Qiang Ma; Zheng Fang; Jie Ma; Yong Sheng Hu; Zhi Bin Zhou; Hong Li; Xue Jie Huang; Li Quan Chen

doi:10.1088/1674-1056/25/7/078203

Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes

Pin Liu, Qiang Ma, Zheng Fang, Jie Ma, Yong Sheng Hu^*, Zhi Bin Zhou, Hong Li, Xue Jie Huang, Li Quan Chen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

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.

Original language	English
Article number	078203
Journal	Chinese Physics B
Volume	25
Issue number	7
DOIs	https://doi.org/10.1088/1674-1056/25/7/078203
Publication status	Published - Jul 2016
Externally published	Yes

Keywords

concentrated electrolytes
dual-salt electrolyte
lithium metal rechargeable batteries

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10.1088/1674-1056/25/7/078203

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Liu, P., Ma, Q., Fang, Z., Ma, J., Hu, Y. S., Zhou, Z. B., Li, H., Huang, X. J., & Chen, L. Q. (2016). Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes. Chinese Physics B, 25(7), Article 078203. https://doi.org/10.1088/1674-1056/25/7/078203

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title = "Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes",

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 = "concentrated electrolytes, dual-salt electrolyte, lithium metal rechargeable batteries",

author = "Pin Liu and Qiang Ma and Zheng Fang and Jie Ma and Hu, {Yong Sheng} and Zhou, {Zhi Bin} and Hong Li and Huang, {Xue Jie} and Chen, {Li Quan}",

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year = "2016",

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doi = "10.1088/1674-1056/25/7/078203",

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AU - Liu, Pin

AU - Ma, Qiang

AU - Fang, Zheng

AU - Ma, Jie

AU - Hu, Yong Sheng

AU - Zhou, Zhi Bin

AU - Li, Hong

AU - Huang, Xue Jie

AU - Chen, Li Quan

PY - 2016/7

Y1 - 2016/7

N2 - 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.

AB - 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.

KW - concentrated electrolytes

KW - dual-salt electrolyte

KW - lithium metal rechargeable batteries

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JO - Chinese Physics B

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Concentrated dual-salt electrolytes for improving the cycling stability of lithium metal anodes

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