Bio-inspired novel choline ester ionic liquid gel polymer electrolytes for safer lithium-ion batteries

Journal of Ionic Liquids Pub Date : 2025-01-05 DOI:10.1016/j.jil.2025.100132

Tommy Hoong Wy Lee, Phei Li Lau, Ianatul Khoiroh

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Abstract

The rise in lithium battery use has triggered concerns regarding safety due to flammable liquid electrolytes. Ionic liquids (ILs) present an alternative, offering low volatility and high stability. This study explores novel choline-based ILs incorporated into a polymer matrix to synthesise ionic liquid gel polymer electrolytes (GPEs). Structural confirmation via Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy verified successful synthesis, while the thermogravimetric analyzer (TGA) revealed their promising thermal stability. GPEs demonstrated remarkable flammability resistance compared to commercial separators. Electrochemical assessments, including electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and galvanostatic charge-discharge (GCD), showcased high ionic conductivities and electrochemical stability. Transference numbers and dendrite growth analysis further underscored their excellent performance. Specifically, GPEs comprising 70 % propionyl choline bis(trifluoromethanesulfonyl)imide within a polymer matrix, poly(vinylidene fluoride)-co-hexafluoropropylene (PVDF-HFP), exhibited exceptional conductivity and transference numbers, positioning them as strong candidates for safer and more efficient lithium-ion battery electrolytes.

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仿生新型胆碱酯离子液体凝胶聚合物电解质，用于更安全的锂离子电池

锂电池使用量的增加引发了人们对易燃液体电解质的安全担忧。离子液体（ILs）提供了一种替代方案，具有低挥发性和高稳定性。本研究探索了一种新的基于胆碱的离子液体凝胶聚合物电解质（gpe）。傅里叶变换红外光谱（FTIR）和核磁共振（NMR）的结构证实了合成的成功，热重分析仪（TGA）显示了它们良好的热稳定性。与商用分离器相比，gpe表现出显著的可燃性。电化学评估，包括电化学阻抗谱（EIS）、线性扫描伏安法（LSV）和恒流充放电（GCD），显示了高离子电导率和电化学稳定性。迁移数和枝晶生长分析进一步强调了它们的优异性能。具体来说，在聚合物基体聚偏氟乙烯-共六氟丙烯（PVDF-HFP）中含有70%丙酰胆碱二（三氟甲烷磺酰）亚胺的gpe表现出优异的导电性和转移率，使其成为更安全、更高效的锂离子电池电解质的有力候选材料。

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来源期刊

Journal of Ionic Liquids

CiteScore

3.70

自引率

0.00%

发文量