水性粘结剂在硅基负极中的应用研究进展

Application of Water-Soluble Binder in Si-based Anodes

粘结剂在锂离子电池中的用量较小,但却起到举足轻重的作用。传统的PVDF粘结剂与电极材料通过范德华力相互作用,粘接性能较差,而且需要选择N-甲基吡咯烷酮作为溶剂具有环境污染问题且价格昂贵。而水性粘结剂具有无溶剂释放、生产环境绿色、成本低、不易燃、使用安全等优点,已成为锂电池关键材料的重要发展方向。在储能领域,硅是所有合金类嵌锂材料中理论储锂容量最高的,但是硅材料在充放电过程中剧烈的体积变化往往导致电池的容量衰减,而合适的粘结剂能够对负极材料起到稳定作用,本文主要综述了水性粘结剂在硅基负极材料中的应用及研究进展。

Binders,though often used in small doses,play a crucial role in determining the electrochemical performance of Li-ion batteries with high energy density.The traditional PVDF binder,which interacts with electrode materials via weak Van der Waals forces ang consequently lacks the necessary capabilities,could not fulfill the high demands of batteries with high energy density.Besides,extensive usage of the PVDF binder in the Li-ion batteries is cost-ineffective and may raise environmental concerns as its handling often needs the assistance of organic solvents.Herein,recent progresses on the development of novel eco-friendly,low-cost and water-soluble binders which recently have gained increasing attention as a promising performance booster for Li-ion batteries with high energy density are reviewed.Such water soluble binder are either nature,or modified,or synthesized,and they were observed with profoundly enhanced chemical/physical interactions with the electrode materials,stronger mechanical adhesion and evidently improved volume variation durability,leading to dramatic improvements in the electrochemical performances of Si-based anodes.Perspectives for future research directions on water soluble binders are also discussed.