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A thermostable ionic liquid-methacrylate-based polymer electrolyte for energy storage application
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DOI：10.1016/j.est.2024.111741.png)
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Abstract
En 中文
In recent years, gel polymer electrolytes (GPEs) incorporating ionic liquids (ILs) have been explored extensively for lithium -ion batteries due to their favourable thermal stability and high ionic conductivity. Gel polymer electrolytes can also improve the safety of lithium -ion batteries by eliminating the flammable organic solvents which are often used in traditional electrolyte systems. Herein, we report an efficient synthesis of a thermostable ionic liquid-methacrylate-based polymer gel electrolyte via a photo -initiated phase separation (PIPS) process in an inert environment. Anionic liquid phase of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI), coupled with a low molecular weight polyethylene glycol dimethyl ether (PEGDME), was combined with a solid phase of bisphenol A ethoxylate dimethacrylate (BEMA) at varying solid to liquid ratios to produce a thermally stable gel electrolyte. The highest ionic conductivity of 1.9 x 10 -3 S cm -1 (at 30 degrees C) was achieved for the electrolyte with a solid -to -liquid ratio of 1:3 by weight. The Lithium metal cells utilizing these electrolytes and LiFePO 4 as cathode active material exhibited the initial discharge capacity of 144 mAh g -1 with capacity retention of 85 % over 100 cycles in ambient temperature. The thermal stability of the cells was significantly improved upon increasing the EMIMTFSI content. This study illustrates the potential application of the ILmethacrylate gel polymer electrolyte system in enhancing the safety of Li -ion batteries through careful tuning of the composition. Their versatile properties also make them suitable for quasi -solid-state batteries with high energy density and safety.
Keywords:
Gel polymer electrolyte
Bicontinuous morphology
Lithium -ion batteries
High ionic conductivity
High thermal stability
Journal
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9.8
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2.2W
Citations:
10.1W