Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

JOURNAL OF POWER SOURCES

卷:406

Article

Janani, Ronak¹  Mader, Kerstin¹  Roberts, Alexander John²  Farmilo, Nicolas¹  Sammon, Chris¹ 

[1] Sheffield Hallam Univ, Mat & Engn Res Inst, City Campus,Howard St, Sheffield S1 1WB, S Yorkshire, England

[2] Univ Warwick, WMG, Coventry CV4 7AL, W Midlands, England

关键词: Curing temperature;    Ionogel;    Supercapacitor;    Porous electrode;    Penetrability coefficient;    Electrode-electrolyte interface;   

DOI  :  10.1016/j.jpowsour.2018.10.049

来源: Elsevier

【 摘 要 】

Fast-cure 1-ethyl-3-methylimidazolium trifluoromethanesulfonate-based ionogels have been realised for the first time. The influence of curing temperature on the structure of ionogels and their performance as the electrolyte for electric double-layer capacitors (EDLCs) has been investigated. Hybrid ionogels were synthesised via a non-hydrolytic sol-gel route and were fully gelled post heat-treating at 125, 150, 175 and 200 degrees C for 60 mm with minimal shrinkage. Charge-transfer resistance (a rate-limiting parameter in cell kinetics during charge/discharge cycles) was reduced by similar to 80% by increasing the heat-treatment temperature; this was partially attributed to the interlocking effect facilitated by high curing temperature. We report a maximum areal capacitance of 95 mF cm(-2). Due to similar to 40% increase In the penetrability coefficient of the ionic liquid, the electrode 'full' wetting time dropped from 48 to 5 h when the curing temperature was increased above 150 degrees C. These results were supported by SEM and Raman spectroscopy to characterise the effect of high temperature heat-treatment on the electrode-ionogel interface and the degree of electrode wetting by the ionic liquid. The fast-cure fabrication process for ionogels removes one of the major hurdles in their industrial application while the improved room temperature ion transport kinetics expands the potential application of ionic liquid-based electrochemical systems.

【 授权许可】

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