Silicon Anode Binder based on Crosslinked Polyurethane with Different Crosslinking Densities
발표자
최재민 (부산대학교)
연구책임자
조남주 (부산대학교)
초록
내용
Li-ion batteries have emerged as the most important energy supply devices. However, graphite electrodes do not satisfy the performance demands of modern high-performance batteries, because graphite suffers from low capacity, high cost and limited power output. To address these demands, many studies on silicon anode are being conducted. In order to commercialize a silicon anode, it is important to suppress the drastic volume expansion of silicon anode.
In this study, polyurethane (PU) binders with different crosslinking densities were synthesized for the silicon anode. The urethane group of polyurethane forms a hydrogen bond with the silanol group on the silicon outside, enabling strong interaction. The electrochemical performance of the battery was evaluated according to the crosslinking density of PU. High crosslinking density effectively suppressed the extreme volume expansion of silicon particle, lowered interfacial resistance, and showed high-capacity retention rate.