Flexibility-Enhancing Cross-linking of Hard-type Heterocyclic Aromatic Polymer Binders for High-Performance Silicon Anodes in Lithium-Ion Batteries
발표자
김규리 (한양대학교)
연구책임자
정인환 (한양대학교)
공동저자
김규리 (한양대학교), 신지영 (한양대학교), 정인환 (한양대학교)
초록
내용
Cross-linked polymer binders are typically utilized in Si-anode-based lithium-ion batteries to suppress volume changes, thereby enhancing the cycle performance of Si-based anodes. However, this curing system is effective primarily for soft-type flexible polymeric backbones and not for hard-type rigid polymeric backbones. In this study, we developed an efficient cross-linking strategy for rigid polyimide and polyamide imidazole, forming network binders via in situ cross-linking with polyhedral oligomeric silsesquioxane (POSS) while mitigating backbone rigidity. The POSS cross-linker robustly connects the polymer chains while suppressing ladder-like backbone formation, thereby avoiding excessive stiffening and enhancing the mechanical integrity of Si anodes during repeated charge/discharge cycling. The proposed networking system demonstrated a higher reversible capacity and enhanced cycle stability compared with that of non-cured binders over 200 cycles at a rate of 0.2 C.