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High-concentrated Electrolyte Design Enables Lithium-ion Pouch Batteries to Stably Operate at Extremely High Temperatures (Supporting Information)

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posted on 2024-05-09, 04:52 authored by Liyuan YAO, Xihua WANG, Dongze LI, Xingai WANG, Haichang ZHANG, Ning WANG, Chunsheng SHI, Fei DING
Due to the poor thermal stability of the lithium hexafluorophosphate (LiPF6) electrolyte system, commercial lithium-ion batteries (LIBs) are difficult for normal operation at high temperatures above 55 °C. The limitation of the LiPF6 electrolyte severely limits the practical application of LIBs under extremely high temperatures conditions. Here, a high-concentration electrolyte based on lithium bis(fluorosufonyl)imide (LiFSI) as electrolyte salt and ethyl methyl carbonate (EMC) as solvent is proposed, which possesses superior electrochemical stability and thermal stability. The LiCoO2/graphite (Gr) pouch battery with the LiFSI high-concentration electrolyte (5.0 mol L−1 (M)) has been shown excellent cycling performance even at 100 °C, an impressive capacity retention of 87.7 % can be still maintained after 100 cycles at 1.0 C-rate. The superior high temperatures performance is mainly attributed to the unique solvated structure, along with the robust solid electrolyte interphase (SEI) rich in anions. This work presents an effective strategy for promoting the development of high-temperature lithium-ion batteries.

Funding

Project for Full-time High-end Talents Introduction of Hebei of China

Hebei Provincial Postdoctoral Science Foundation

Natural Science Foundation of Hebei Province

Science and technology research project of colleges and universities in Hebei Province

Basic Research Fund of Hebei University of Technology

History

Corresponding author email address

hczhang@hebut.edu.cn

Copyright

© 2024 The Author(s).

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