The Polymer Society of Korea

Abstract

With the rapid growth of EV and ESS markets, achieving high energy density in LIBs has become increasingly important. Silicon is a promising next-generation anode material due to its high theoretical capacity and low operating potential, but severe volume changes during cycling significantly degrade electrode stability. To address this issue, this study develops a high-performance poly(acrylic acid) (PAA)-based binder, termed PAA-APDS, to simultaneously enhance the structural stability and electrochemical performance of silicon anodes. The PAA-APDS binder exhibits self-healing behavior based on reversible disulfide bonds and effectively maintains electrode structural integrity during cycling through multiple hydrogen-bonding interactions and strong intermolecular interactions with the current collector. Consequently, the silicon anode employing the PAA-APDS binder delivers a high reversible capacity of 2262 mAh g⁻¹ with an excellent capacity retention of 95% after 300 cycles.