Li Yanling, Wang Xiang, Liang Jianyu, Wu Kuan, Xu Long, Wang Jun
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.
Polymers (Basel). 2020 Apr 1;12(4):764. doi: 10.3390/polym12040764.
A zeolite/polyimide composite separator with a spongy-like structure was prepared by phase inversion methods based on heat-resistant polyimide (PI) polymer matrix and ZSM-5 zeolite filler, with the aim to improve the thermal stability and electrochemical properties of corresponding batteries. The separator exhibits enhanced thermal stability and no shrinkage up to 180 °C. The introduction of a certain number of ZSM-5 zeolites endows the composite separator with enhanced wettability and electrolyte uptake, better facilitating the free transport of lithium-ion. Furthermore, the composite separator shows a high ionic conductivity of 1.04 mS cm at 25 °C, and a high decomposition potential of 4.7 V. Compared with the PP separator and pristine PI separator, the ZSM-5/PI composite separator based LiFePO/Li cells have better rate capability (133 mAh g at 2 C) and cycle performance (145 mAh g at 0.5 C after 50 cycles). These results demonstrate that the ZSM-5/PI composite separator is promising for high-performance and high-safety lithium-ion batteries.
基于耐热聚酰亚胺（PI）聚合物基体和ZSM-5沸石填料，通过相转化法制备了具有海绵状结构的沸石/聚酰亚胺复合隔膜，旨在提高相应电池的热稳定性和电化学性能。该隔膜具有增强的热稳定性，在高达180°C时不收缩。引入一定数量的ZSM-5沸石赋予复合隔膜增强的润湿性和电解液吸收能力，更有利于锂离子的自由传输。此外，复合隔膜在25°C时显示出1.04 mS cm的高离子电导率和4.7 V的高分解电位。与PP隔膜和原始PI隔膜相比，基于ZSM-5/PI复合隔膜的LiFePO/Li电池具有更好的倍率性能（2 C时为133 mAh g）和循环性能（50次循环后0.5 C时为145 mAh g）。这些结果表明，ZSM-5/PI复合隔膜在高性能和高安全性锂离子电池方面具有广阔前景。
