[3PS-289]
Cross-Linked Ion-Conductive Polyphosphazene Binders Enabling Stable Silicon Anodes
발표자이지수 (서울대학교)
연구책임자이종찬 (서울대학교 화학생물공학부)
Abstract
Silicon anodes offer high theoretical capacity for lithium-ion batteries but suffer from mechanical degradation caused by large volume changes during cycling. In this study, a cross-linked polyphosphazene-based polymer binder is developed to enhance the structural stability of silicon electrodes. The binder consists of a flexible polyphosphazene backbone with carboxylic acid groups that promote strong interfacial interaction with silicon particles, together with poly(ethylene glycol) segments that facilitate lithium-ion transport within the electrode. Controlled cross-linking during electrode drying improves elastic modulus and adhesion strength while maintaining polymer flexibility. Compared to a conventional poly(acrylic acid) binder, the optimized polyphosphazene binder exhibits improved ionic conductivity, enhanced electrochemical kinetics, and superior mechanical integrity.