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- W2969143003 abstract "With growing public demand for consumer safety regarding electronic devices,ionogels have recently been suggested as a safe and solid replacement for theconventional flammable and toxic organic electrolytes used for various energystorage devices including batteries and supercapacitors. Ionogels are poroussolid scaffolds that encapsulate ionic liquids and prevent electrolyte leakagewhich can otherwise be a potential hazard to the consumer or the surroundingcircuitry. In this work, sol-gel was utilised as a manufacturing technique for 1-ethyl-3-methylimidazolium trifluoromethanesulfonate based-ionogels. Sol-gelchemistry is a facile and industrially relevant technology that allows the formationof solid scaffolds from homogenous precursors including a variety of siliconalkoxides. Previous studies have used a single or a mixture of silicon alkoxidesto fabricate ionogels. In this work, four different precursors (twotetraalkoxysilanes and two alkyltrialkoxysilanes) were utilised to explore the influenceof the type of silicon alkoxide on the reaction kinetics, thermal stability,microstructure and the electrochemical performance of the ionogels as electrolytefor electric double-layer capacitors (EDLCs).Furthermore, thermally-cured 1-ethyl-3-methylimidazolium trifluoromethanesulfonate-based ionogels have been realised for the first time in this work. Theinfluence of curing temperature on the structure of the ionogels and their electrochemicalperformance as the electrolyte for EDLCs have been investigated.Ionogels were synthesised via a non-hydrolytic sol-gel route and were fullygelled post heat-treating at 125, 150, 175 and 200°C for 60 minutes with minimalshrinkage. Charge transfer resistance (a rate-limiting parameter in cell kineticsduring charge/discharge cycles) was reduced by ∼80% via increasing theheat-treatment temperature; this was partially attributed to the interlocking effectat the electrode-electrolyte interface facilitated by high curing temperature. Thefast-cure fabrication process for ionogels removes one of the major hurdles intheir industrial application, their long curing and aging time, while the improvedroom temperature ion transport kinetics expands the potential application of ionicliquid-based electrochemical systems. Finally, an exploratory investigation onthe long-term stability of the fabricated EDLCs indicated that cells with 150°C cured ionogels show an improved electrochemical performance compared tothe EDLCs with ionic liquid electrolyte without the gel network.The results gathered in this work provide an insight into sol-gel processed ionogelsas a replacement for the conventional electrolyte formulations and furtherproves that, this class of materials has the potential to be a safe, solid and durableelectrolyte for EDLCs." @default.
- W2969143003 created "2019-08-22" @default.
- W2969143003 creator A5008209255 @default.
- W2969143003 date "2019-07-05" @default.
- W2969143003 modified "2023-10-03" @default.
- W2969143003 title "Synthesis and characterisation of sol- gel based ionogels as electrolyte for supercapacitors" @default.
- W2969143003 doi "https://doi.org/10.7190/shu-thesis-00192" @default.
- W2969143003 hasPublicationYear "2019" @default.
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