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

doi:10.6023/A1110212

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

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LiPF₆/三氟乙酰胺室温熔盐的制备及在碳-碳电容器中的性能

左晓希^a, 李奇^a, 刘建生^b, 肖信^a, 范成杰^a, 南俊民^a

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 Xiaoxi^a, Li Qi^a, Liu Jiansheng^b, Xiao Xin^a, Fan Chengjie^a, Nan Junmin^a

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

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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.

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LiPF₆/三氟乙酰胺室温熔盐的制备及在碳-碳电容器中的性能

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

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LiPF6/三氟乙酰胺室温熔盐的制备及在碳-碳电容器中的性能