期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 19, 页码 16612-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03854
关键词
Lithium ion battery; PP-ZIF-67-CH3OH separator; Polypropylene separator; Metal-organic frameworks; Thermal stability
资金
- Key Research and Development Plan of Shandong Province [2018YFJH0402]
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 cells capacity retention (61.5%) compared with the cell that used pure PP separator (0.0%) after 100 cycles at a high temperature of 55 degrees 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.
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