Key Factors for Binders to Enhance the Electrochemical Performance of Silicon Anodes through Molecular Design
Haoli Wang, Baozhu Wu, Xikai Wu, Qiangqiang Zhuang, Tong Liu, Yu Pan, Gejun Shi, Huimin Yi, Pu Xu, Zhennan Xiong, Shulei Chou, Baofeng Wang
Abstract
Silicon is considered the most promising candidate for anode material in lithium-ion batteries due to the high theoretical capacity. Unfortunately, the vast volume change and low electric conductivity have limited the application of silicon anodes. In the silicon anode system, the binders are essential for mechanical and conductive integrity. However, there are few reviews to comprehensively introduce binders from the perspective of factors affecting performance and modification methods, which are crucial to the development of binders. In this review, several key factors that have great impact on binders' performance are summarized, including molecular weight, interfacial bonding, and molecular structure. Moreover, some commonly used modification methods for binders are also provided to control these influencing factors and obtain the binders with better performance. Finally, to overcome the existing problems and challenges about binders, several possible development directions of binders are suggested.