丙酸乙酯对LiFePO4锂离子电池低温性能的影响

doi:10.61558/2993-074X.2955

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (3): 237-245. doi: 10.61558/2993-074X.2955

• 锂离子和燃料电池近期研究专辑（厦门大学董全峰教授主编） • 上一篇下一篇

丙酸乙酯对LiFePO₄锂离子电池低温性能的影响

李小平^1,2*，郝连升¹，李伟善^1*，许梦清¹，邢丽丹¹

1. 华南师范大学化学与环境学院，广东广州 510006；2. 东莞市迈科新能源有限公司，广东东莞 523800

收稿日期:2012-10-12 修回日期:2013-01-06 出版日期:2013-06-28 发布日期:2013-01-13
基金资助:
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

Effect of Ethyl Propionate on Low-Temperature Performance of LiFePO₄-Based Li-Ion Battery

LI Xiao-ping^1,2*, HAO Lian-sheng¹, LI Wei-shan¹, XU Meng-qing¹, XING Li-dan¹

1. School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China; 2. Mcnair New Power Co., Ltd, Dongguan, Guangdong 523800, China

Received:2012-10-12 Revised:2013-01-06 Published:2013-06-28 Online:2013-01-13

摘要/Abstract

摘要： 以丙酸乙酯（EP）作为碳酸乙烯酯（EC）、碳酸甲乙酯（EMC）和碳酸二甲酯（DMC）的共溶剂，研究其对LiFePO₄锂离子电池低温电化学性能的影响. 利用循环伏安曲线、交流阻抗图谱和恒电流充放电曲线等方法测试电池电化学性能. 结果表明，添加一定量EP，可提高碳酸酯电解液的离子电导率，改善电解液与正极LiFePO₄材料和负极石墨材料的相容性，从而提高了LiFePO₄锂离子电池的低温性能. 使用1 mol·L^-1 LiPF₆/(EC:EMC:DMC:EP=1:1:1:3, by mass)电解液的石墨/LiFePO₄锂离子电池在10 ºC（1C）、-10 ºC（0.2C）、-20 ºC（0.2C）、-30 ºC（0.2C）和-40 ºC（0.2C）下的相对放电容量（以25 ºC时的放电容量为基准）分别为82.9%、75.6%、59.0%、46.4%和37.6%.

关键词:

锂离子电池, 磷酸铁锂, 低温性能, 丙酸乙酯

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 ^oC (1C), -10 ^oC (0.2C), -20 ^oC (0.2C), -30 ^oC (0.2C), and -40 ^oC (0.2C), respectively.

Key words:

lithium ion battery, LiFePO₄, low-temperature performance, ethyl propionate

中图分类号:

O646

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（中英文）, 2013, 19(3): 237-245.

LI Xiao-Ping, HAO Lian-Sheng, LI Wei-Shan, XU Meng-Qing, XING Li-Dan. Effect of Ethyl Propionate on Low-Temperature Performance of LiFePO₄-Based Li-Ion Battery[J]. Journal of Electrochemistry, 2013, 19(3): 237-245.

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https://electrochem.xmu.edu.cn/CN/Y2013/V19/I3/237

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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

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