Additive-Assisted Novel Dual-Salt Electrolyte Addresses Wide Temperature Operation of Lithium-Metal Batteries

Xuehui Shangguan; Gaojie Xu; Zili Cui; Qinglei Wang; Xiaofan Du; Kai Chen; Suqi Huang; Guofeng Jia; Faqiang Li; Xiao Wang; Di Lu; Shanmu Dong; Guanglei Cui

doi:10.1002/smll.201900269

Additive-Assisted Novel Dual-Salt Electrolyte Addresses Wide Temperature Operation of Lithium-Metal Batteries

Small. 2019 Apr;15(16):e1900269. doi: 10.1002/smll.201900269. Epub 2019 Mar 8.

Authors

Xuehui Shangguan^{1

2

3}, Gaojie Xu¹, Zili Cui¹, Qinglei Wang^{1

3}, Xiaofan Du¹, Kai Chen¹, Suqi Huang¹, Guofeng Jia², Faqiang Li², Xiao Wang¹, Di Lu¹, Shanmu Dong¹, Guanglei Cui¹

Affiliations

¹ Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, P. R. China.
² Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, P. R. China.
³ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

PMID: 30848874
DOI: 10.1002/smll.201900269

Abstract

In this study, self-synthesized lithium trifluoro(perfluoro-tert-butyloxyl)borate (LiTFPFB) is combined with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) to formulate a novel 1 m dual-salt electrolyte, which contains lithium difluorophosphate (LiPO₂ F₂ ) additive and dominant carbonate solvents with low melting point and high boiling point. The addition of LiPO₂ F₂ into this novel dual-salt electrolyte dramatically improves cycleability and rate capability of a LiNi_0.5 Mn_0.3 Co_0.2 O₂ /Li (NMC/Li) battery, ranging from -40 to 90 °C. The NMC/Li batteries adopt a Li-metal anode with low thickness of 100 µm (even 50 µm) and a moderately high cathode mass loading level of 10 mg cm^-2 . For the first time, this paper provides valuable perspectives for developing practical lithium-metal batteries over a wide temperature range.

Keywords: additive; dual-salt electrolyte; lithium-metal battery; solid electrolyte interphase; wide temperature operation.

Abstract

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