Formation of direct chemical-bonding of PVDF-based binder with silicon particles through the reaction of thiol group and double bond
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초록
내용
Recently, silicon is attracted attention as a high-capacity anode active material. However, practical application of silicon anodes is restricted by their huge volume change during repetitive charge-discharge process, leading to pulverization of the Si particles and growth of unstable solid-electrolyte interphase (SEI) layer. In this respect, binders play a key role in maintaining mechanical integrity of electrode and suppressing the volume expansion of Si particles. In this study, we synthesize double-bonds in PVDF-based polymer through dehydrochlorination of P(VDF-co-CTFE). Subsequently, we modify the hydroxyl groups on the silicon surface with thiol groups using silane coupling agent to take advantage of the high reactivity of thiol group with double-bond. This modification facilitates direct chemical bonding between silicon particles and PVDF-based binder. The resulting 3D cross-linked network structure contributes to increasing the adhesive force between the anode materials.