【摘要】：針對(duì)傳統(tǒng)聚烯烴類鋰離子電池隔膜的耐溫性差和電解液親和性差的問題,本實(shí)驗(yàn)以微孔沸石納米粒子和聚偏氟乙烯樹脂(PVDF)為主要原料,通過相轉(zhuǎn)化法制備了綜合性能優(yōu)異的沸石/PVDF復(fù)合鋰電隔膜。結(jié)果表明:與商用聚乙烯(PE)膜相比,所制備的沸石/PVDF復(fù)合隔膜具有更加發(fā)達(dá)的孔道結(jié)構(gòu),其孔隙率超過70%,約為PE膜的2倍。沸石/PVDF復(fù)合膜的耐高溫性和電解液潤濕性明顯優(yōu)于PE膜和純PVDF膜,經(jīng)過160℃、0.5h的高溫處理后,復(fù)合膜的熱收縮率僅為5%,而PE膜已完全融化,收縮率達(dá)到100%,PVDF膜收縮率超過50%;沸石/PVDF復(fù)合膜的電解液接觸角僅為7.4°,而PE膜和PVDF膜的接觸角高達(dá)42.5°和31.7°。受益于豐富的孔道結(jié)構(gòu)和良好的電解液吸收/保持能力,沸石/PVDF復(fù)合膜所裝配鋰離子電池的倍率放電容量高于PE膜,同時(shí),該復(fù)合膜裝配電池的循環(huán)性能也優(yōu)于傳統(tǒng)聚乙烴隔膜。
[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，

本文編號(hào)：2378008