储能科学与技术2024，Vol.13Issue(7)：2131-2140,10.DOI:10.19799/j.cnki.2095-4239.2024.0338
低温磷酸铁锂电池用全醚高熵电解液的设计研究
Design and research of all-ether high-entropy electrolyte for low-temperature lithium iron phosphate batteries
摘要
Abstract
Lithium iron phosphate(LFP)materials are known for their outstanding cycle stability and energy density at room temperature(RT,25℃);however,their performance at low temperatures(LT,-20℃)is hindered owing to poor ionic conductivity and sluggish kinetics.This study introduces a novel all-ether high-entropy electrolyte,formulated by integrating ethers of varying solvating powers,to enhance the electrochemical performance of LFP batteries at LT.Experimental results confirm that this approach considerably enhances the ionic conductivity and kinetic stability of the electrolyte at LT,thereby substantially improving the low-temperature discharge capacity and cycle lifespan of LFP batteries.The mix-7 electrolyte variant,in particular,demonstrates exceptional charge-discharge stability at LT.After 150 cycles,it retains a high capacity retention rate of 99.7%and maintains 81.1%of its initial capacity at RT.This strategy proves effective and versatile,markedly enhancing the low-temperature performance and broadening the application spectrum of LFP batteries.关键词
锂离子电池/磷酸铁锂正极/低温性能/醚类溶剂/高熵电解液Key words
lithium-ion batteries/lithium iron phosphate cathode/low-temperature performance/ether solvents/high-entropy electrolyte分类
信息技术与安全科学引用本文复制引用
王美龙,薛煜瑞,胡文茜,杜可遇,孙瑞涛,张彬,尤雅..低温磷酸铁锂电池用全醚高熵电解液的设计研究[J].储能科学与技术,2024,13(7):2131-2140,10.基金项目
国家重点研发计划(2022YFB3803400),宜宾市揭榜挂帅项目(2022JB003). （2022YFB3803400）
