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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (22): 2531-2535.    下一篇

研究论文

锂离子电池电解液成膜添加剂乙烯基亚硫酸乙烯酯的电化学行为

姚万浩a，李 劼a，张忠如a，高 军a，王周成b，杨 勇*,a   

  1. (a厦门大学化学化工学院固体表面物理化学国家重点实验室 厦门 361005) (b厦门大学化学工程与生物工程系 厦门 361005)
  • 投稿日期:2009-05-05 修回日期:2009-07-03 发布日期:2009-07-20
  • 通讯作者: 杨勇 E-mail:yyang@xmu.edu.cn
  • 基金资助:

    国家自然科学基金（20473068，29985310）;国家“九七三”计划（2007CB209702）

Electrochemical Behavior of Vinyl Ethylene Sulfite as an Electrolyte Film-forming Additive in Lithium Ion Batteries

Yao, Wanhaoa，Li, Jiea，Zhang, Zhongrua，Gao, Juna， Wang, Zhoucheng b，Yang, Yong*,a   

  1. (a State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005) (b Department of Chemical and Biochemical Engineering, Xiamen University, Xiamen 361005)
  • Received:2009-05-05 Revised:2009-07-03 Published:2009-07-20

PDF

2740

被引次数

14

研究了具有不饱和双键和亚硫酸酯双官能团的乙烯基亚硫酸乙烯酯(VES)作为锂离子电池电解液成膜添加剂对中间相碳微球(CMS)和LiFePO4电极电化学性能的影响. 结果表明: 在1 mol/L LiClO4/PC电解液体系中, 少量的VES (5%)能够在电化学过程中先于PC在CMS表面还原, 形成稳定的SEI膜, 明显抑制PC和溶剂化锂离子共嵌入石墨层间, 改善了电池的循环性能. 此外, 电解液1 mol/L LiClO4/PC＋5%VES (V∶V)在LiFePO4电极中展现出良好的电化学稳定性.

关键词: 乙烯基亚硫酸乙烯酯(VES, 电解液添加剂, 固体电解质界面(SEI)膜, 碳酸丙烯酯

A film-forming additive, vinyl ethylene sulfite (VES) with both vinylene group and sulfite group, affects the electrochemical performance of carbonaceous mesophase spherules (CMS) and LiFePO4 electrode. The results indicated that a small amount of VES (5%) could be reduced prior to the propylene carbonate (PC) solvent on the surface of CMS electrode in PC-based electrolyte to form a stable solid electrolyte interphase (SEI) layer, so co-intercalation of PC and solvated lithium ions to graphite could be suppressed. Furthermore, the electrolyte of 1 mol/L LiClO4/PC＋5%VES (V∶V) exhibited excellent electrochemical stability in the LiFePO4 electrode.

Key words: vinyl ethylene sulfite, electrolyte additive, solid electrolyte interphase (SEI) layer, propylene carbonate