Citation: Peng Wang, Guanyu Zhao, Yicai Pan, Yujing Li, Chenxi Fu, Shipeng Sun, Junqi Gai, Jinping Mu, Xue Bai, Xiaohui Li, Jinfeng Sun, Xiaodong Shi, Rui He. Dual-salt electrolyte strategy enables stable interface reaction and high-performance lithium-ion batteries at low temperature[J]. Chinese Chemical Letters, ;2025, 36(11): 111190. doi: 10.1016/j.cclet.2025.111190 shu

Dual-salt electrolyte strategy enables stable interface reaction and high-performance lithium-ion batteries at low temperature

Peng Wang ^a ,
Guanyu Zhao ^{a, b} ,
Yicai Pan ^c ,
Yujing Li ^d ,
Chenxi Fu ^a ,
Shipeng Sun ^a ,
Junqi Gai ^{a, *,} ,
Jinping Mu ^b ,
Xue Bai ^b ,
Xiaohui Li ^b ,
Jinfeng Sun ^a ,
Xiaodong Shi ^{e, *,} ,
Rui He ^{b, *,}

a.
Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
b.
Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang 050081, China
c.
Department of Materials Science and Engineering & Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong 999077, China
d.
Hebei Jiaotong Vocational and Technical College, Shijiazhuang 050035, China
e.
School of Marine Science and Engineering, Hainan University, Haikou 570228, China

laogai01@126.com

shixiaodong@hainanu.edu.cn

kxyherui@163.com

Received Date: 27 January 2025
Revised Date: 2 April 2025
Accepted Date: 9 April 2025
Available Online: 9 April 2025

Figures(5)

Lithium-ion batteries (LIBs) are increasingly required to operate under harsh conditions, particularly at low-temperature condition. Developing novel electrolytes is a facile and effective approach to elevate the electrochemical performances of LIBs at low temperature. Herein, a dual-salt electrolyte consisting of (lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB)) is proposed to regulate the solvation structure of Li⁺ ions and improve the reaction kinetics under low temperature. Based on the comprehensive electrochemical tests and theoretical computations, the introduction of LiODFB component not only effectively benefits the formation of cathode electrolyte interface (CEI) layer on the surface of LiFePO₄ electrode, but also inhibits the chemical corrosion effect of LiTFSI-containing electrolytes on Al foil. As expected, the optimized LiLiFePO₄ cells can display high reversible capacity of 117.0 mAh/g after 100 cycles at -20 ℃. This work provides both theoretical basis and experimental guidance for the rational design of low-temperature resistant electrolytes.
- Dual-salt electrolyte,
- Solvation structure,
- Cathode electrolyte interface layer,
- Low-temperature performance,
- Lithium-ion batteries
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