Tailor-Made Polynorbornene Binders for Silicon Anodes in Lithium-Ion Batteries
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초록
내용
Silicon (Si) is promising for developing high energy density and fast charging anode in lithium ion batteries. However, the severe volume change of Si anodes during charging and discharging limits their commercial success. Properly designed polymer binders, which provide strong adhesion and robust mechanical integrity to the Si anode, offer a potential solution. In this study, we synthesized a series of polynorbornene-based multifunctional binders comprising ethylene glycol and carboxylic acid groups via ring-opening metathesis polymerization (ROMP). Owing to the living nature of ROMP, sequence-controlled (co)polymers with controlled molecular weights and narrow dispersion are easily prepared. The mechanical properties and adhesion strength of these tailor-made polymers can be systematically altered. Si anodes employing these binders are successfully fabricated, and their various electrochemical performances are investigated, highlighting the importance of molecular weight and functional group distribution in these binders.