Synthesis and Electrochemical Characterization of Three-dimensionally crosslinked copolymer Binders for Silicon-based Lithium Ion Battery Anodes
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초록
내용
Silicon has been acknowledged 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 copolymers of acrylic acid and n-butyl acrylate which were further crosslinked to improve the mechanical properties. Thermal and mechanical properties of the binders were tailored by tuning the composition of random copolymers and crosslinking density. Interestingly, the electrochemical performance of Si anode made from these binders showed satisfactory performance when the composition of soft n-butyl acrylate is maintained at 10-30 mol%. Comparison of the electrochemical performance of crosslinked and uncrosslinked binders revealed that moderately crosslinked binders give rise to superior performance in terms of initial discharge capacity and columbic efficiency.