电化学2013，Vol.19Issue(3)：237-245,9.
丙酸乙酯对LiFePO4锂离子电池低温性能的影响
Effect of Ethyl Propionate on Low-Temperature Performance of LiFePO4-Based Li-Ion Battery
摘要
Abstract
A linear carboxylic,ester ethyl propionate(EP),was used as the co-solvent of carbonates,ethylene carbonate(EC),ethyl-methyl carbonate(EMC)and dimethyl carbonate(DMC),and its effect on low-temperature performance of LiFePO4-based Li-ion battery was studied by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and galvanostatic charge-discharge test.The application of EP enhances the ionic conductivity of the electrolyte,improves the compatibility of the electrolyte with both LiFePO4 and graphite materials,and thus improves the low-temperature performance of LiFePO4-based Li-ion battery.The Li-ion battery using the optimized electrolyte of 1 mol·L-1 LiPF6/EC∶EMC∶DMC∶EP(1∶1∶1∶3)shows the capacity retention of 82.9％,75.6％,59.0％,46.4％,and 37.6％ of discharge capacity at room temperature when discharged at 10 ℃(1C),-10℃(0.2C),-20 ℃(0.2C),-30 ℃(0.2C),and-40 ℃(0.2C),respectively.关键词
锂离子电池/磷酸铁锂/低温性能/丙酸乙酯Key words
lithium ion battery/LiFePO4/low-temperature performance/ethyl propionate分类
化学化工引用本文复制引用
李小平,郝连升,李伟善,许梦清,邢丽丹..丙酸乙酯对LiFePO4锂离子电池低温性能的影响[J].电化学,2013,19(3):237-245,9.基金项目
广东省科技计划攻关项目(No.2010A010200001)和省部院产学研结合重大专项(No.2012A090300012)资助 （No.2010A010200001）
