硅(Si)被认为是下一代锂离子电池最有前途的负极材料,由于其较高的理论能力,安全,和高自然丰度。然而,硅阳极的商业应用受到其巨大体积膨胀的阻碍,导电性差,库仑效率低。对于阳极制造,粘合剂起着粘合硅材料的重要作用,电流收集器,和导电剂,粘结剂结构会显著影响机械耐久性,附着力,离子/电子电导率,和硅阳极的固体电解质界面(SEI)稳定性。此外,许多交联粘合剂有效地减轻硅纳米尺寸甚至微米尺寸的阳极材料的体积膨胀,同时保持阳极完整性和稳定的电化学性能。这个迷你评论根据其结构全面总结了各种粘合剂,包括线性,分支,三维(3D)交联,导电聚合物,和其他混合粘合剂。各种粘结剂结构影响硅阳极性能的机理,的局限性,并讨论了不同混合粘结剂的发展前景。这篇小型评论可以帮助设计混合聚合物粘合剂,并促进具有高电化学活性和长期稳定性的硅基阳极的实际应用。
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.