储能科学与技术2025，Vol.14Issue(12)：4450-4459,10.DOI:10.19799/j.cnki.2095-4239.2025.0562
局部高浓电解液在低温钠离子电池中的应用研究
Application of a localized high-concentration electrolyte in low-temperature sodium-ion batteries
摘要
Abstract
Sodium-ion batteries(SIBs)have attracted considerable attention as large-scale energy storage systems owing to their low cost and high safety.However,their performance deteriorates significantly at low temperatures because of increased electrolyte viscosity,reduced ionic conductivity,and enhanced interfacial polarization.In this study,fluorobenzene—characterized by low viscosity,low melting point,and chemical inertness—was introduced as a diluent into a conventional electrolyte to formulate a low-temperature electrolyte based on a localized high-concentration strategy.The incorporation of the diluent optimized the electrolyte's solvation structure,reduced the fraction of free solvent molecules,and suppressed side reactions at low temperatures.Moreover,the localized high-concentration approach increased the effective concentration of sodium salts and additives within the solvation sheath,thereby regulating the interfacial composition,enriching inorganic components in the solid-electrolyte interphase,and improving both interfacial stability and ionic conductivity.The SIBs employing this electrolyte exhibited a capacity retention of 85.75%at-40℃and 87.14%after 50 cycles at-20℃.During low-temperature cycling,no abnormal phenomena such as gas evolution,sodium plating,or particle fracture were observed.In addition to enhancing low-temperature performance,the electrolyte also maintained excellent high-temperature stability,demonstrating broad applicability across a wide temperature range.关键词
钠离子电池/电解液/局部高浓电解液/氟苯Key words
sodium ion batteries/electrolyte/localized high concentration electrolyte/fluorobenzene分类
信息技术与安全科学引用本文复制引用
YAO Yuan,WANG Yanyan,TAO Boran..局部高浓电解液在低温钠离子电池中的应用研究[J].储能科学与技术,2025,14(12):4450-4459,10.基金项目
国家重点研发计划(2022YFB2402500). （2022YFB2402500）
