Acta Chimica Sinica ›› 2008, Vol. 66 ›› Issue (12): 1441-1445. Previous Articles     Next Articles

全氟烷基膦酸锂电解液的制备与性能研究

毕成良*,a 郭爱红b 唐雪娇a 高 敏a 张宝贵a   

  1. (a南开大学环境科学与工程学院 天津 300071)
    (b河北理工大学资源与环境学院 唐山 063009)
  • 收稿日期:2007-09-16 修回日期:2007-12-17 出版日期:2008-06-28 发布日期:2008-06-28
  • 通讯作者: 毕成良

Preparation and Performance of Lithium Perfluoroalkylphosphonate

BI, Cheng-Liang *,a GUO, Ai-Hong b TANG, Xue-Jiao a GAO, Min a ZHANG, Bao-Gui a   

  1. (a College of Environmental Science and Engineering, Nankai University, Tianjin 300071)
    (b College of Resources and Environment, Hebei Polytechnic University, Tangshan 063009)
  • Received:2007-09-16 Revised:2007-12-17 Online:2008-06-28 Published:2008-06-28
  • Contact: BI, Cheng-Liang

Lithium perfluoroalkylphosphonate was synthesized by LiF and perfluoroalkylphosphonate acid obtained by electrochemically fluorinating chlorodiisopropylphosphine. Some properties of a kind of electrolyte that was made from dissolving the lithium perfluoroalkylphosphonate in the mixed solvent with ethylene carbonate (EC) and dimethyl carbonate (DMC) mass ratio 1∶1 were investigated, such as conductivity, stability toward hydrolysis and oxidative decomposition potential, and so on. The electrolyte was studied by a secondary cell testing system. Using LiCoO2 as anode, Li as cathode, it was found that the discharge platform was 3.7 V, initial discharge capacity was 107 mA•h•g-1 and efficiency still remained 102% after cycled 50 times while capacity decreased largely after 40 times. The electrochemical impedance spectroscopy diagram showed that the electrolyte electrochemical impedance was nearly 140 Ω. The results indicated that the lithium perfluoroalkylphosphonate was expected to be the new electrolyte salt of lithium-ion rechargeable batteries.

Key words: electrochemical fluorination, Li-ion secondary battery, lithium perfluoroalkylphosphonate