Integrated solid electrolyte-binder system with semi-interpenetrating polymer network for silicon anode in lithium-ion battery
발표자
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초록
내용
Silicon is recognized as a promising anode material for next-generation lithium-ion batteries due to its high energy density. However, silicon undergoes significant volume changes during charge and discharge cycles, leading to cracking. These cracks expose new surfaces to the liquid electrolyte, resulting in the formation of unstable SEI layers on the surface, decreasing battery capacity. To mitigate this capacity degradation, an integrated solid electrolyte binder system is introduced. In this study, a polymer electrolyte is fabricated by introducing a semi-IPN structure into a PAA electrolyte grafted with PEG segments in the presence of an ionic liquid. The electrolyte demonstrated a high ionic conductivity of 1.61 × 10-3 S/cm, an ionic transference number of ~0.7, as well as mechanical stability of 1.63 MPa. This integrated structure enhances compatibility between the binder and the electrolyte, preventing structural degradation of the electrode and improving long-term cycling performance.