Molecular Design and Electrochemical Characterization of Poly(acrylic acid)-co-Poly(n-butyl acrylate) Binders for Silicon-based Lithium Ion Battery Anodes
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Silicon has attracted great interest as a promising anode material for lithium-ion batteries due to their high theoretical capacity. However, a significant volume change of the silicon during charge/discharge causes pulverization in the anode, and thus becomes a major obstacle for commercialization. A potential way to solve this problem is to develop polymer binders that can alleviate volume change of silicon. For this purpose, we synthesized a series of poly(acrylic acid)-co-poly(n-butyl acrylate) by RAFT polymerization. Thermal and mechanical properties of the binders were tailored by tuning the composition of random copolymers. Interestingly, it was found that electrochemical performance of Si anode made from these binders showed the highest performance when the amount of soft n-butyl acrylate (10-30 mol%) was introduced to the rigid PAA. We have also demonstrated that chemical crosslinking of RC73 can improve the initial discharge capacity and Coulombic efficiency.