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Metal–Organic Frameworks Enabled High-Performance Separators for Safety-Reinforced Lithium Ion Battery

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journal contribution
posted on 25.09.2019, 01:29 authored by Pan Chen, Huimin Ren, Liting Yan, Jianxing Shen, Tailin Wang, Guangda Li, Shunwei Chen, Xiaotong Cong, Jixun Xie, Wei Li
Separators in lithium ion batteries (LIBs) play critical roles in offering ion-conducting routes and preventing the occurrence of internal short circuit. Here, a novel strategy to improve the thermal and cyclic stabilities of polypropylene (PP) separator is demonstrated. The PP separator surface is fully covered by a thin layer of zeolitic imidazolate framework-67 (ZIF-67) to form PP–ZIF-67 composite separator, which boosts cell performance better than the pure PP separator through a direct coating method. For example, the PP separator coated with ZIF-67 samples synthesized in methanol (CH3OH) greatly enhanced the cell’s capacity retention (61.5%) compared with the cell that used pure PP separator (0.0%) after 100 cycles at a high temperature of 55 °C. Our results also show that the battery performance is affected by ZIF-67 samples that are synthesized in different solvents, implying that the battery performance may be further enhanced by optimizing the ZIF-67 structures. The proposed strategy paves a new avenue for achieving high-safety LIBs in this work.