物理化学学报 >> 2009, Vol. 25 >> Issue (02): 201-206.doi: 10.3866/PKU.WHXB20090201

研究论文 上一篇    下一篇

添加剂氟代碳酸乙烯酯对锂离子电池性能的影响

许杰; 姚万浩; 姚宜稳; 王周成; 杨勇   

  1. 厦门大学化学化工学院, 福建 厦门 361005
  • 收稿日期:2008-09-10 修回日期:2008-10-21 发布日期:2009-01-16
  • 通讯作者: 王周成 E-mail:zcwang@xmu.edu.cn

Effect of Fluoroethylene Carbonate Additive on the Performance of Lithium Ion Battery

XU Jie; YAO Wan-Hao; YAO Yi-Wen; WANG Zhou-Cheng; YANG Yong   

  1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Provine, P. R. China
  • Received:2008-09-10 Revised:2008-10-21 Published:2009-01-16
  • Contact: WANG Zhou-Cheng E-mail:zcwang@xmu.edu.cn

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摘要： 在1 mol·L-1 LiPF6/碳酸乙烯酯(EC)+碳酸二甲酯(DMC)+碳酸甲乙酯(EMC)(EC、DMC、EMC体积比为1:1:1)电解液中加入体积比为2%的添加剂氟代碳酸乙烯酯(FEC), 用循环伏安法(CV)、扫描电镜(SEM)、能量散射光谱(EDS)、电化学阻抗谱(EIS)等方法, 研究了FEC 对锂离子电池性能及石墨化中间相碳微球(MCMB)电极/电解液界面性质的影响. 结果表明, 体积比2%FEC的添加可以抑制部分电解液溶剂的分解, 在MCMB电极表面形成一层性能优良的固体电解液相界面(SEI)膜, 降低了电池的阻抗, 明显提高了电池的比容量和循环稳定性.

关键词: 添加剂, 氟代碳酸乙烯酯, 锂离子电池, 循环伏安, 能量散射光谱, 电化学阻抗谱

Abstract: Fluoroethylene carbonate (FEC) with a volume ratio of 2%was added to the electrolyte containing 1 mol·L-1 LiPF6 in ethylene carbonate (EC), dimethyl carbonate (DMC), and methyl ethyl carbonate (EMC) (1:1:1 by volume). The effects of FEC on lithiumion battery performance and on the mesocarbon microbead (MCMB) electrode/electrolyte interphase were studied by cyclic voltammetry (CV), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and electrochemical impedance spectroscopy (EIS). The results indicated that the application of a 2% (volume ratio) of FEC suppressed electrolyte decomposition and caused the formation of an excellent solid electrolyte interphase (SEI) film on the MCMB electrode. The battery resistance decreased while the specific capacity and cyclic stability of the battery increased.

Key words: Additive, Fluoroethylene carbonate, Lithiumion battery, Cyclic voltammetry, Energy dispersive spectroscopy, Electrochemical impedance spectroscopy