Synthesis of Grafted Polymer Binders Exhibiting Adhesion and Viscoelasticity for Silicon-based Anodes
발표자
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초록
내용
With the increasing demand for high-performance batteries, graphite is being replaced by silicon, a new-generation anode material with high theoretical specific capacity. However, due to battery performance deterioration caused by serious volume changes, a new functional polymer binder for silicon-based anode active material is needed. To solve this problem, we synthesized a polybutylacrylate-g-polyacrylic acid (PBA-g-PAA) polymer binder, which has a rubbery PBA backbone and adhesive PAA side chain. We achieved this through reversible addition/fragmentation chain transfer polymerization with n-butyl acrylate and inimer, allowing us to synthesize a rubbery random copolymer backbone with an atom transfer radical polymerization (ATRP) initiator. Additionally, via ATRP and deprotection, we could graft the adhesive PAA side chain, which can form strong hydrogen bonding interactions between binder-binder and binder-silicon. To prove the performance of this binder, we conducted peel tests and viscoelastic and electrochemical tests.