Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO2 at high voltage

doi:10.1088/1674-1056/24/7/078201

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 78201-078201.doi: 10.1088/1674-1056/24/7/078201

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO₂ at high voltage

张舒^a, 李文俊^a, 凌仕刚^a, 李泓^a, 周志彬^b, 陈立泉^a

a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Key Laboratory for Large-Format Battery Materials and System (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

收稿日期:2015-04-14 修回日期:2015-04-28 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the Beijing S&T Project, China (Grant No. Z13111000340000), the National Basic Research Program of China (Grant No. 2012CB932900), and the National Natural Science Foundation of China (Grants Nos. 51325206 and 51421002).

Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO₂ at high voltage

Zhang Shu (张舒)^a, Li Wen-Jun (李文俊)^a, Ling Shi-Gang (凌仕刚)^a, Li Hong (李泓)^a, Zhou Zhi-Bin (周志彬)^b, Chen Li-Quan (陈立泉)^a

a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Key Laboratory for Large-Format Battery Materials and System (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2015-04-14 Revised:2015-04-28 Online:2015-07-05 Published:2015-07-05
Contact: Li Hong E-mail:hli@iphy.ac.cn
Supported by:
Project supported by the Beijing S&T Project, China (Grant No. Z13111000340000), the National Basic Research Program of China (Grant No. 2012CB932900), and the National Natural Science Foundation of China (Grants Nos. 51325206 and 51421002).

摘要/Abstract

摘要： The cycling performance, impedance variation, and cathode surface evolution of the Li/LiCoO₂ cell using LiFSI–KFSI molten salt electrolyte are reported. It is found that this battery shows poor cycling performance, with capacity retention of only about 67% after 20 cycles. It is essential to understand the origin of the instability. It is noticed that the polarization voltage and the impedance of the cell both increase slowly upon cycling. The structure and the properties of the pristine and the cycled LiCoO₂ cathodes are investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, x-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). It is found that the LiCoO₂ particles are corroded by this molten salt electrolyte, and the decomposition by-product covers the surface of the LiCoO₂ cathode after 20 cycles. Therefore, the surface side reaction explains the instability of the molten salt electrolyte with LiCoO₂.

关键词: lithium ion battery, molten salt electrolyte, lithium bis(fluorosulfonyl)imide, potassium bis(fluorosulfonyl)imide

Abstract: The cycling performance, impedance variation, and cathode surface evolution of the Li/LiCoO₂ cell using LiFSI–KFSI molten salt electrolyte are reported. It is found that this battery shows poor cycling performance, with capacity retention of only about 67% after 20 cycles. It is essential to understand the origin of the instability. It is noticed that the polarization voltage and the impedance of the cell both increase slowly upon cycling. The structure and the properties of the pristine and the cycled LiCoO₂ cathodes are investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, x-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). It is found that the LiCoO₂ particles are corroded by this molten salt electrolyte, and the decomposition by-product covers the surface of the LiCoO₂ cathode after 20 cycles. Therefore, the surface side reaction explains the instability of the molten salt electrolyte with LiCoO₂.

Key words: lithium ion battery, molten salt electrolyte, lithium bis(fluorosulfonyl)imide, potassium bis(fluorosulfonyl)imide

中图分类号: (Lithium-ion batteries)

82.47.Aa

65.40.gk (Electrochemical properties) 82.45.Fk (Electrodes)

张舒, 李文俊, 凌仕刚, 李泓, 周志彬, 陈立泉. Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO₂ at high voltage[J]. 中国物理B, 2015, 24(7): 78201-078201.

Zhang Shu (张舒), Li Wen-Jun (李文俊), Ling Shi-Gang (凌仕刚), Li Hong (李泓), Zhou Zhi-Bin (周志彬), Chen Li-Quan (陈立泉). Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO₂ at high voltage[J]. Chin. Phys. B, 2015, 24(7): 78201-078201.

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Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO₂ at high voltage

Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO₂ at high voltage

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