Binders for Si based electrodes: Current status, modification strategies and perspective

Silicon based materials have attracted much attention and expectations because of their high energy densities. However, due to the failure behaviors caused by the inherent volume change during cycling and poor conduc-tivity of Si materials, the existing strategies that modify electrode materials have only improved the performance to a certain extent. Binders, which could be functionalized to effectively alleviate the volume expansion, have gradually attract researchers' attention. Nowadays, the modification of conventional binders and the develop-ment of novel multifunctional binders have realized multiple achievements. Thus, we comprehensively sum-marize all the conventional linear polymer binders, and systematically introduce all the modification methods of linear polymer binders based on the intermolecular interactions and structural design, moreover, the develop-ment of novel multifunctional binders, such as conductivity binders, self-healing binders, and biomass binders which are environmentally friendly are demonstrated. Therefore, we hope the summarization of modification strategies and multifunctional binders could be instructive for the design of novel binders, and by developing novel binders we could promote the commercialization of Si-based anodes.

Automated summary

Silicon-based materials have garnered significant attention and expectations due to their high energy densities. However, the volume change during cycling and poor conductivity of Si materials pose challenges, limiting the effectiveness of existing modification strategies for electrode materials. Researchers are now turning their focus to functionalizable binders that can alleviate volume expansion. This comprehensive review highlights the various conventional linear polymer binders, their modification methods based on intermolecular interactions and structural design, and the development of novel multifunctional binders such as conductivity binders, self-healing binders, and environmentally friendly biomass binders. The summarization of modification strategies and multifunctional binders aims to guide the design of novel binders and promote the commercialization of Si-based anodes.