Sun Guohua, Guo Jiacong, Niu Hongqing, Chen Nanjun, Zhang Mengying, Tian Guofeng, Qi Shengli, Wu Dezhen
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology Beijing 100029 China
Department of Energy Engineering, College of Engineering, Hanyang University Seoul 04763 Republic of Korea.
RSC Adv. 2019 Dec 4;9(68):40084-40091. doi: 10.1039/c9ra08006f. eCollection 2019 Dec 2.
Herein, we design a controllable approach for preparing multifunctional polybenzimidazole porous membranes with superior fire-resistance, excellent thermo-stability, and high wettability. Specifically, the recyclable imidazole is firstly utilized as the eco-friendly template for micropores formation, which is an interesting finding and has tremendous potential for low-cost industrial production. The unique backbone structure of the as-prepared polybenzimidazole porous membrane endows the separator with superb thermal dimensional stability at 300 °C. Most significantly, the inherent flame retardancy of polybenzimidazole can ensure the high security of lithium-ion batteries, and the existence of polar groups of imidazole can regulate the Li flux and improve the ionic conductivity of lithium ions. Notably, the cell with a polybenzimidazole porous membrane presents higher capability (131.7 mA h g) than that of a commercial Celgard membrane (95.4 mA h g) at higher charge-discharge density (5C), and it can work normally at 120 °C. The fascinating comprehensive properties of the polybenzimidazole porous membrane with excellent thermal-stability, satisfying wettability, superb flame retardancy and good electrochemical performance indicate its promising application for high-safety and high-performance lithium-ion batteries.
在此，我们设计了一种可控方法来制备具有卓越耐火性、出色热稳定性和高润湿性的多功能聚苯并咪唑多孔膜。具体而言，可回收的咪唑首先被用作形成微孔的环保模板，这是一个有趣的发现，在低成本工业生产方面具有巨大潜力。所制备的聚苯并咪唑多孔膜独特的主链结构赋予隔膜在300°C时具有出色的热尺寸稳定性。最重要的是，聚苯并咪唑固有的阻燃性可确保锂离子电池的高安全性，咪唑极性基团的存在可调节锂通量并提高锂离子的离子电导率。值得注意的是，在较高充放电密度（5C）下，具有聚苯并咪唑多孔膜的电池比商业Celgard膜（95.4 mA h g）具有更高的容量（131.7 mA h g），并且它可以在120°C下正常工作。聚苯并咪唑多孔膜具有出色的热稳定性、令人满意的润湿性、卓越的阻燃性和良好的电化学性能等迷人的综合性能，表明其在高安全性和高性能锂离子电池方面具有广阔的应用前景。
