LiPF_6/三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 LiPF_6 and 2Trifluoroacetamide

作　　者：左晓希[1] 李奇[1] 刘建生 肖信[1] 范成杰[1] 南俊民[1] 

机构地区：[1]华南师范大学化学与环境学院,广州510006 [2]广州天赐高新材料股份有限公司,广州510760

出　　处：《化学学报》2012年第4期367-371,共5页Acta Chimica Sinica

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

摘　　要：利用LiPF6和三氟乙酰胺为前驱物,制备了低共熔温度约为-62℃的室温熔盐,并测试了该熔盐作为碳-碳电化学电容器(EDLCs)电解液时的性能。其中,使用差示扫描量热法(DSC)和红外光谱法(FTIR)分析了不同LiPF6和三氟乙酰胺配比熔盐的热稳定性,拟制了该二元组分的共熔相图,认为LiPF6和三氟乙酰胺极性基团间的氢键作用促成了室温熔盐的形成。循环伏安(CV)、交流阻抗(EIS)和电导等测定结果表明,所制备的LiPF6/三氟乙酰胺电解液的室温电导率为1.30mS/cm,电化学窗口大于5.6V,大于60℃的使用温度,作为电解液可满足碳-碳EDLCs的使用要求。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.

关 键 词：室温熔盐 LIPF6 三氟乙酰胺 热性能 电化学性能 

分 类 号：TM53[电气工程—电器]