Crosslinked Bottlebrush Polymer Binders Exhibiting Adhesion and Elasticity for Silicon-based Anodes
발표자
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초록
내용
High-performance batteries require replacing graphite with silicon, a next-generation anode material with high theoretical specific capacity. However, silicon's significant volume changes during charge/discharge cycles deteriorate battery performance, necessitating a new functional polymer binder for silicon-based anodes. To address this problem, we designed a polymer binder system using adhesive bottlebrush polymers and elastic crosslinkers. The bottlebrush structure enhances polymer processability by backbone elongation and functionality by densely exposing adhesive poly(acrylic acid) functional groups. We synthesized the bottlebrush polymer via ring-opening metathesis polymerization and introduced soft, rubbery poly(ethylene glycol) diglycidyl ether crosslinked among bottlebrush polymers through an epoxy-carboxylic acid reaction. The binder's adhesion and elasticity were tested using peel and loading-unloading tests, and its mechanical properties were assessed by tensile test.