Synthesis and electrochemical performance of lithium sulfonimide solid polymer electrolyte

Jinlan LIANG, Daohuan WU, Haifeng ZOU, Zhuo CHEN, Jinliang ZHUANG, Hu CHENG

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (7) : 174-181. DOI: 10.11868/j.issn.1001-4381.2024.000166
RESEARCH ARTICLE

Synthesis and electrochemical performance of lithium sulfonimide solid polymer electrolyte

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Abstract

Fluorinated and cyanosubstituted lithium sulfonimide （LiFBTFSI and LiCBTFSI） are synthesized from 4-fluorobenzene sulfonyl chloride and 4-cyanobenzene sulfonyl chloride by sulfonylation and ion exchange， respectively. Two PEO based polymer electrolytes （PEO20-LiFBTFSI and PEO20-LiCBTFSI） are prepared by solution casting， and their micromorphology， thermal stability and electrochemical properties are characterized. The results show that at 60 ℃ and EO/Li+=20， the ionic conductivity of the two solid electrolyte reaches 10-4 S/cm， the electrochemical stability window is greater than 5 V， and the battery assembled with lithium iron phosphate has a high initial discharge capacity （0.1 C， ≈150 mAh·g-1）. Compared with the fluorine PEO20-LiFBTFSI solid electrolyte， the cyan-containing PEO20-LiCBTFSI solid electrolyte has better electrochemical stability and interface compatibility. After 50 cycles， the specific discharge capacity of the battery is 137.4 mAh·g-1， and the capacity retention rate is 93.0%. In addition， the cyano-containing PEO20-LiCBTFSI solid electrolyte has good electrochemical stability with lithium metal， and the assembled lithium symmetric battery operates stably at a current density of 0.1 mA/cm2 for 500 h without short circuit.

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lithium-ion battery / polymer electrolyte / lithium salt / polyoxyethylene

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Jinlan LIANG , Daohuan WU , Haifeng ZOU , et al . Synthesis and electrochemical performance of lithium sulfonimide solid polymer electrolyte. Journal of Materials Engineering. 2025, 53(7): 174-181 https://doi.org/10.11868/j.issn.1001-4381.2024.000166

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