Two is Better Than One: Integrating Adhesion and Ion-Conductivity in Dual-Functional Binder for High-Performance Silicon Anodes
발표자
()
초록
내용
The choice of binder plays a vital role in addressing the volume expansion and related problems of silicon (Si) anodes. Poly(acrylic acid) (PAA) is a benchmark binder due to its strong interaction with the Si surface. However, the brittleness and non-conducting characteristics of PAA binder cause its performance to degrade over extended cycles. In this study, we develop dual-functional binders by integrating the commercially-available PAA with a newly synthesized terpolymer comprising (1) Li-ion conducting groups, (2) hydrogen bonding groups, and (3) cross-linkable groups. The synergy of these two polymers enhances both the electrochemical performance and stability of Si anodes, achieving a specific capacity of 2026 mAh g⁻¹ and a capacity retention of 71% over 300 cycles which outperforms the PAA-based electrode. Our dual-functional binder approach effectively and simultaneously improves various essential properties of the electrode, such as adhesion, mechanical strength, ion-conductivity and electrode morphology.