高锂盐含量的小鏻阳离子离子液体电解质的电化学和物理化学性质
Electrochemical and physicochemical properties of small phosphonium cation ionic liquid electrolytes with high lithium salt content.
作者信息
Girard G M A, Hilder M, Zhu H, Nucciarone D, Whitbread K, Zavorine S, Moser M, Forsyth M, MacFarlane D R, Howlett P C
机构信息
Institute for Frontier Materials (IFM), Deakin University, Burwood, Victoria 3125, Australia.
出版信息
Phys Chem Chem Phys. 2015 Apr 14;17(14):8706-13. doi: 10.1039/c5cp00205b. Epub 2015 Mar 4.
Electrolytes of a room temperature ionic liquid (RTIL), trimethyl(isobutyl)phosphonium (P111i4) bis(fluorosulfonyl)imide (FSI) with a wide range of lithium bis(fluorosulfonyl)imide (LiFSI) salt concentrations (up to 3.8 mol kg(-1) of salt in the RTIL) were characterised using a combination of techniques including viscosity, conductivity, differential scanning calorimetry (DSC), electrochemical impedance spectroscopy (EIS), nuclear magnetic resonance (NMR) and cyclic voltammetry (CV). We show that the FSI-based electrolyte containing a high salt concentration (e.g. 1 : 1 salt to IL molar ratio, equivalent to 3.2 mol kg(-1) of LiFSI) displays unusual transport behavior with respect to lithium ion mobility and promising electrochemical behavior, despite an increase in viscosity. These electrolytes could compete with the more traditionally studied nitrogen-based ionic liquids (ILs) in lithium battery applications.
使用包括粘度、电导率、差示扫描量热法（DSC）、电化学阻抗谱（EIS）、核磁共振（NMR）和循环伏安法（CV）等多种技术，对室温离子液体（RTIL）三甲基（异丁基）鏻（P111i4）双（氟磺酰）亚胺（FSI）与各种浓度的双（氟磺酰）亚胺锂（LiFSI）盐（在RTIL中盐浓度高达3.8 mol kg⁻¹）的电解质进行了表征。我们表明，尽管粘度增加，但含有高盐浓度的基于FSI的电解质（例如盐与离子液体的摩尔比为1∶1，相当于3.2 mol kg⁻¹的LiFSI）在锂离子迁移率方面表现出异常的传输行为，并具有良好的电化学行为。这些电解质在锂电池应用中可以与更传统研究的氮基离子液体（ILs）相竞争。
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