通过不同配比的勃姆石(BH)对超高分子量聚乙烯(UHMWPE)锂电池隔膜进行了共混改性,研究其对锂电池隔膜穿刺强度、拉伸性能、耐热性能和结晶性能等影响。结果表明:当BH质量含量为4%时,锂电池隔膜综合性能较好,穿刺强度提高20%、透气度提升25%、MD方向热收缩降低60.7%,TD方向热收缩降低51.1%。扫描电镜结果表明:当BH质量含量为4%时,BH的颗粒嵌在UHMWPE基体树脂中,表面有多孔网络缠结,有利于提高BH与UHMWPE之间的界面结合力。
The ultra-high molecular weight polyethylene (UHMWPE) membrane of lithium battery was modified by blending by different proportion of bomer stone (BH).The results showed that when BH content was 4wt%,the comprehensive performance of separator was good,the puncture strength increased by 20%,the permeability increased by 25%,the thermal contraction in MD direction decreased by 60.7%,and the thermal contraction in TD direction decreased by 51.1%.SEM results shown that when the content of BH was 4wt%,BH particles were embedded in UHMWPE matrix resin,and the surface was entangled with porous network,which was conducive to improving the interfacial binding force between BH and UHMWPE.
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