期刊
JOURNAL OF POWER SOURCES
卷 326, 期 -, 页码 549-559出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.06.085
关键词
Electrolyte; Ionic liquid; Sulfonium; Supercapacitor
资金
- EPSRC [EP/L505262/1, S3802ASA]
- Innovate UK for the Practical Lithium-Air Batteries project [101577]
- Bundesministerium fur Bildung and Forschung (BMBF) [03EK3010]
- EPSRC [EP/L505262/1] Funding Source: UKRI
- Innovate UK [101577] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L505262/1, 1492725] Funding Source: researchfish
A novel cyclic sulfonium cation-based ionic liquid (IL) with an ether-group appendage and the bis {(trifluoromethyl)sulfonyl}imide anion was synthesised and developed for electrochemical double layer capacitor (EDLC) testing. The synthesis and chemical-physical characterisation of the ether-group containing IL is reported in parallel with a similarly sized alkyl-functionalised sulfonium IL. Results of the chemical-physical measurements demonstrate how important transport properties, i.e. viscosity and conductivity, can be promoted through the introduction of the ether-functionality without impeding thermal, chemical or electrochemical stability of the IL. Although the apparent transport properties are improved relative to the alkyl-functionalised analogue, the ether-functionalised sulfonium cation-based IL exhibits moderately high viscosity, and poorer conductivity, when compared to traditional EDLC electrolytes based on organic solvents (propylene carbonate and acetonitrile). Electrochemical testing of the ether-functionalised sulfonium IL was conducted using activated carbon composite electrodes to inspect the performance of the IL as a solvent-free electrolyte for EDLC application. Good cycling stability was achieved over the studied range and the performance was comparable to other solvent-free, IL-based EDLC systems. Nevertheless, limitations of the attainable performance are primarily the result of sluggish transport properties and a restricted operative voltage of the IL, thus highlighting key aspects of this field which require further attention. (C) 2016 The Authors. Published by Elsevier B.V.
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