Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (04): 367-371.DOI: 10.6023/A1110212     Next Articles

Full Papers


左晓希a, 李奇a, 刘建生b, 肖信a, 范成杰a, 南俊民a   

  1. a 华南师范大学化学与环境学院 广州 510006;
    b 广州天赐高新材料股份有限公司 广州 510760
  • 投稿日期:2011-10-21 修回日期:2011-11-29 发布日期:2011-11-30
  • 通讯作者: 南俊民
  • 基金资助:

    国家自然科学基金青年基金(No. 21003045)、广东省产学研计划(No. 2009B090300389)及2011 广州市黄埔区科技计划资助项目.

Preparation and Performances of Room Molten Salt as Electrolyte in Carbon-carbon Capacitor Based on LiPF6 and Trifluoroacetamide

Zuo Xiaoxia, Li Qia, Liu Jianshengb, Xiao Xina, Fan Chengjiea, Nan Junmina   

  1. a School of Chemistry and Environment, South China Normal University, Guangzhou 510006;
    b Guangzhou Tinci Materials Technology Co., Ltd., Guangzhou 510760
  • Received:2011-10-21 Revised:2011-11-29 Published:2011-11-30
  • Supported by:

    Project was supported by the Young Scientists Fund of the National Natural Science Foundation of China (No. 21003045), the Department of Guangdong Province produced in academic and research projects (No. 2009B090300389) and Huangpu District, Guangzhou Science and Technology Project, 2011.

A novel room molten salt with an eutectic temperature of about -62 ℃ is prepared using LiPF6 and trifluoroacetamide as precursors. And then its performances are evaluated in carbon-carbon electrochemical double layer capacitor (EDLC) as electrolyte. The thermal properties of the complex electrolyte with different molar ratios are characterized and then the liquid-solid phase diagram is presented by using differential scanning calorimeter (DSC) and Fourier transform infrared spectroscopy (FTIR). The hydrogen bonding interaction between LiPF6 and trifluoroacetamide molecules is attributed to the formation of the as-prepared molten salt. In addition, the results of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and conductance tests show that the as-prepared LiPF6/trifluoroacetamide electrolyte has a maximum conductance at room temperature, i.e. 1.30 mS/cm, a stable electrochemical window of ca. 5.6 V, an applicable temperature of more than 60 ℃, suggesting it is a promising electrolyte candidate for carbon-carbon EDLCs.

Key words: room molten salt, LiPF6, trifluoroacetamide, thermal property, electrochemical performance