In-situ Polymerized Gel Electrolytes for Lithium-ion Polymer Batteries with Enhanced Safety
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The liquid electrolyte currently used in commercially available lithium-ion batteries is composed of organic solvents, making it highly volatile and flammable, which can lead to safety issues such as fire hazards and leakage. In this study, we developed gel polymer electrolytes (GPEs) by integrating liquid electrolytes into a polymer matrix, addressing these safety concerns. GPEs possess properties that lie between those of liquids and solids, allowing them to display both high ionic conductivity and thermal stability, which is facilitated by the presence of the polymer matrix. Through in-situ UV polymerization, we improved the interfacial contact between the electrolyte and the electrode's active material. The GPE was found to be flexible, self-standing, and demonstrated lower flammability compared to liquid electrolytes. In coin cell tests, the GPE exhibited excellent lifetime characteristics, retaining 83% of the initial discharge capacity even after 200 charge-discharge cycles.