Research progress in 3D network structured water-soluble binders for lithium-ion batteries

• Main Authors: ZHANG Jian-hua, ZHANG Wei, YU Zhang-long, SHI Bi-meng, YANG Juan-yu
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2021-06-01
• Series: Journal of Materials Engineering
• Subjects: lithium-ion battery; silicon-based anode; water-soluble binder; 3d network binder
• Online Access: http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001112

Silicon has been a pivotal material for the next generation lithium-ion batteries, owing to its superior theoretical capacity (4200 mAh·g^-1). However, the huge volume change of silicon during the process of lithiation/delithiation will lead to the instability of silicon-based anode. As a main composition of electrode, the binder plays a critical role in connecting the electrode components together and maintaining the stability of electrode, the use of an appropriate binder is essential to improve the cycling stability of silicon-based anode. Water-soluble binders which have abundant functional groups have received extensive attention due to their excellent performance in improving the electrochemical performance of silicon-based anodes. In this paper, the research progress of water-soluble binders used in silicon-based anode was reviewed. First, the properties of one-dimensional linear binders were summarized. On this basis, the research progress of composite binders with three-dimensional (3D) network structure was mainly introduced. The structure and properties of different 3D network binders were systematically analyzed. Finally, the preferred structure and properties of the water-soluble binders for silicon-based anode were proposed, and a train of thought for water-soluble binders’ choice and design was provided.