聚偏氟乙烯-沸石复合锂电隔膜的制备及性能
发布时间：2018-12-14 05:25
【摘要】：针对传统聚烯烃类锂离子电池隔膜的耐温性差和电解液亲和性差的问题,本实验以微孔沸石纳米粒子和聚偏氟乙烯树脂(PVDF)为主要原料,通过相转化法制备了综合性能优异的沸石/PVDF复合锂电隔膜。结果表明:与商用聚乙烯(PE)膜相比,所制备的沸石/PVDF复合隔膜具有更加发达的孔道结构,其孔隙率超过70%,约为PE膜的2倍。沸石/PVDF复合膜的耐高温性和电解液润湿性明显优于PE膜和纯PVDF膜,经过160℃、0.5h的高温处理后,复合膜的热收缩率仅为5%,而PE膜已完全融化,收缩率达到100%,PVDF膜收缩率超过50%;沸石/PVDF复合膜的电解液接触角仅为7.4°,而PE膜和PVDF膜的接触角高达42.5°和31.7°。受益于丰富的孔道结构和良好的电解液吸收/保持能力,沸石/PVDF复合膜所装配锂离子电池的倍率放电容量高于PE膜,同时,该复合膜装配电池的循环性能也优于传统聚乙烃隔膜。
[Abstract]:In order to solve the problem of poor temperature resistance and electrolyte affinity of traditional polyolefin lithium-ion battery membranes, microporous zeolite nanoparticles and polyvinylidene fluoride (PVDF) resin were used as raw materials. Zeolite / PVDF composite lithium separator with excellent comprehensive properties was prepared by phase inversion method. The results show that the zeolite / PVDF composite membrane has more developed pore structure than commercial polyethylene (PE) membrane, and its porosity is more than 70, about twice as much as that of PE membrane. The heat resistance of zeolite / PVDF composite membrane and the wettability of electrolyte were obviously superior to those of PE membrane and pure PVDF membrane. After treatment at 160 鈩，
本文编号：2378008
[Abstract]:In order to solve the problem of poor temperature resistance and electrolyte affinity of traditional polyolefin lithium-ion battery membranes, microporous zeolite nanoparticles and polyvinylidene fluoride (PVDF) resin were used as raw materials. Zeolite / PVDF composite lithium separator with excellent comprehensive properties was prepared by phase inversion method. The results show that the zeolite / PVDF composite membrane has more developed pore structure than commercial polyethylene (PE) membrane, and its porosity is more than 70, about twice as much as that of PE membrane. The heat resistance of zeolite / PVDF composite membrane and the wettability of electrolyte were obviously superior to those of PE membrane and pure PVDF membrane. After treatment at 160 鈩，
本文编号：2378008
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