Multifunctional Self-Cross-Linked Copolymer Binder for High-Loading Silicon Anodes

Due to its ultra-high capacity and moderately low potential, silicon (Si) shows potential in replacing graphite-based anodes. Unfortunately, Si suffers from severe intrinsic volume expansions that restrict its practical use. Herein, we present a tailored copolymer, poly(acrylamide)-co-poly(hydroxymethylacrylate), p(AM-co- HMA), as a multifunctional binder for Si anodes, which forms a 3D network structure via a thermally induced self-cross-linking reaction. The formed cross-linked binder structure provides both covalent and hydrogen bonds and thereby improves both the adhesion between the individual electrode components and the current collector as well as the adhesion between the individual Si particles. Overall, the p(AM-co-HMA)-based binder offers superior electrochemical performance for high-loading Si anodes compared to traditionally applied binder systems.

Automated summary

Silicon has potential to replace graphite-based anodes, but its expansion limits practical use. In this study, a tailored copolymer binder, p(AM-co-HMA), forms a 3D network structure through self-crosslinking reaction, improving adhesion between electrode components and silicon particles. Overall, the p(AM-co-HMA) binder shows superior electrochemical performance for high-loading silicon anodes compared to traditional binders.