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为提高锂离子电池隔膜的亲液性和耐温性,提高锂离子电池的综合性能,采用涂覆方法制备PVDF-无纺布复合隔膜,并对隔膜进行碱处理改性。结果表明,所制备复合膜表面具有发达的海绵状孔道结构,孔径约为2μm。改性后的隔膜对电解液具有良好的亲和性,电解液接触角由PP无纺布的140°降低至40°,吸液率由最初的70%提高到约300%,而复合膜自身的形貌和结构没有发生明显变化。改性后的隔膜对电解液具有更好的吸附作用,由于吸附更多的电解液,锂离子在膜层中的传递阻力更小。因此,改性后的复合膜装配的锂离子电池显示出优良的电池容量保持性。
In order to improve the lyophilicity and temperature resistance of the lithium ion battery separator and improve the comprehensive performance of the lithium ion battery, a PVDF non-woven composite membrane is prepared by a coating method, and the separator is subjected to alkali treatment and modification. The results show that the prepared composite membrane surface has a sponge-like pore structure, a pore size of about 2μm. The modified membrane had good affinity with the electrolyte. The contact angle of the electrolyte decreased from 140 ° to 40 ° for the PP nonwoven fabric, and the liquid absorption rate increased from 70% to 300%. The composite membrane itself The morphology and structure did not change significantly. Modified membrane on the electrolyte has better adsorption, due to adsorption of more electrolyte, lithium ion transmission resistance in the membrane smaller. Therefore, the modified composite membrane assembled lithium-ion battery shows excellent battery capacity retention.