Zhu Wenqiang, Zhou Junjian, Xiang Shuang, Bian Xueting, Yin Jiang, Jiang Jianhong, Yang Lishan
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), National and Local Joint Engineering Laboratory for New Petrochemical Materials and Fine Utilization of Resources, Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, Hunan Normal University, Changsha, China.
Hunan Engineering Research Center for Water Treatment Process and Equipment, China Machinery International Engineering Design and Research Institute Co., Ltd., Changsha, China.
Front Chem. 2021 Oct 12;9:712225. doi: 10.3389/fchem.2021.712225. eCollection 2021.
Silicon (Si) has been counted as the most promising anode material for next-generation lithium-ion batteries, owing to its high theoretical specific capacity, safety, and high natural abundance. However, the commercial application of silicon anodes is hindered by its huge volume expansions, poor conductivity, and low coulombic efficiency. For the anode manufacture, binders play an important role of binding silicon materials, current collectors, and conductive agents, and the binder structure can significantly affect the mechanical durability, adhesion, ionic/electronic conductivities, and solid electrolyte interface (SEI) stability of the silicon anodes. Moreover, many cross-linked binders are effective in alleviating the volume expansions of silicon nanosized even microsized anodic materials along with maintaining the anode integrity and stable electrochemical performances. This mini review comprehensively summarizes various binders based on their structures, including the linear, branched, three-dimensional (3D) cross-linked, conductive polymer, and other hybrid binders. The mechanisms how various binder structures influence the performances of the silicon anodes, the limitations, and prospects of different hybrid binders are also discussed. This mini review can help in designing hybrid polymer binders and facilitating the practical application of silicon-based anodes with high electrochemical activity and long-term stability.
硅（Si）因其高理论比容量、安全性和高天然丰度，被视为下一代锂离子电池最具潜力的负极材料。然而，硅负极的商业应用受到其巨大的体积膨胀、低导电性和低库仑效率的阻碍。对于负极制造而言，粘结剂在粘结硅材料、集流体和导电剂方面起着重要作用，且粘结剂结构会显著影响硅负极的机械耐久性、粘附性、离子/电子导电性以及固体电解质界面（SEI）稳定性。此外，许多交联粘结剂在缓解硅纳米甚至微米级负极材料的体积膨胀方面很有效，同时能保持负极完整性和稳定的电化学性能。本综述全面总结了基于结构的各类粘结剂，包括线性、支化、三维（3D）交联、导电聚合物以及其他混合粘结剂。还讨论了各种粘结剂结构影响硅负极性能的机制、不同混合粘结剂的局限性和前景。本综述有助于设计混合聚合物粘结剂，并推动具有高电化学活性和长期稳定性的硅基负极的实际应用。
