聚酰亚胺作为锂离子电池硅基负极粘结剂的研究进展

A Review of Polyimide Material as Silicon-based Anode Binder for Lithium Ion Batteries

硅基负极材料是提升锂离子电池能量密度的重要材料基础,负极粘结剂性能的优劣是影响硅基负极材料推广应用的关键因素。本文全面综述了锂离子电池负极粘结剂材料的研究及应用进展,详细阐述了粘结剂对于硅基负极材料及锂离子电池电化学性能的影响,简要介绍了目前常用的羧甲基纤维素(CMC)、聚丙烯酸(PAA)、海藻酸盐(Alg)三种硅基负极粘结剂的特点,重点讨论了聚酰亚胺(PI)材料作为负极粘结剂的优势,其分子结构可设计、形变可逆、高强高模等优点有望抑制硅基负极体积膨胀并避免颗粒粉化,系统综述了目前PI在硅基负极粘结剂中的研究进展。在此基础上,为PI粘结剂后续研究提供了新的方法策略,为锂离子电池负极粘结剂的开发和应用提供了新的设计理念。

Silicon-based anode materials,as the critical components of high energy density lithium ion batteries,play a significant role in using at the commercial market.This review summarizes the research progress and application of binder materials in silicon-based anode for lithium ion batteries,explains the mechanism of binder on improving electrochemical performance,and introduces the traditional silicon-based anode binder systems,such as carboxymethyl cellulose(CMC),poly(acrylic acid)(PAA),alginate(Alg).Polyimide(PI)material,which is widely known for its plentiful structure design,remarkable mechanical strength and reversible deformation,has been the most promising binder material to inhibit the volume expansion and avoid particle fracture of the silicon-based anode.Herein,the research progress of PI binder for silicon-based anode is systematically reviewed,the corresponding design strategies are emphatically proposed,and future novel concepts relating to research as well as application are presented.