4.6 Article

Electrochemical and physicochemical properties of small phosphonium cation ionic liquid electrolytes with high lithium salt content

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 14, Pages 8706-8713

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00205b

Keywords

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Funding

  1. ARC (Australian Research Council)
  2. Cytec Canada Inc.
  3. NMR LIEF grant
  4. Linkage Project [LP120200181]
  5. Australian Research Council [LP120200181] Funding Source: Australian Research Council

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Electrolytes of a room temperature ionic liquid (RTIL), trimethyl(isobutyl) phosphonium (P-111i4) 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.

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