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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 04: 367 - 371

DOI: https://doi.org/10.6023/A1110212

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

  • Zuo Xiaoxi ,
  • Li Qi ,
  • Liu Jiansheng ,
  • Xiao Xin ,
  • Fan Chengjie ,
  • Nan Junmin
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  • a School of Chemistry and Environment, South China Normal University, Guangzhou 510006;
    b Guangzhou Tinci Materials Technology Co., Ltd., Guangzhou 510760

Received date: 2011-10-21

  Revised date: 2011-11-29

  Online 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.

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Abstract

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

Cite this article

Zuo Xiaoxi , Li Qi , Liu Jiansheng , Xiao Xin , Fan Chengjie , Nan Junmin . Preparation and Performances of Room Molten Salt as Electrolyte in Carbon-carbon Capacitor Based on LiPF6 and Trifluoroacetamide[J]. Acta Chimica Sinica, 2012 , 70(04) : 367 -371 . DOI: 10.6023/A1110212

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