Polymer-Clay Nanocomposite Solid-State Electrolyte for Lithium-ion Batteries
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초록
내용
Here, we report an ultraviolet (UV)-crosslinked composite polymer-clay electrolyte (U-CPCE) that comprises a durable semi-interpenetrating polymer network (semi-IPN) ion transportive matrix (ETPTA/PVdF-HFP) and 2D ultrathin clay nanosheets that is fabricated by a one-step in situ UV curing method. The U-CPCE exhibits robust and flexible properties with an ionic conductivity of more than 10-3 S/cm at room temperature with the help of exfoliated clay nanosheets. As a result, the U-CPCE-based LIBs show an initial discharge capacity of 152 mAh g-1 (at 0.2 C for a LiCoO2 half-cell), which is comparable to that of conventional liquid electrolyte-based cells. In addition, they show excellent cycling performance (96% capacity retention after 200 cycles at 0.5 C) due to a significantly enhanced Li+ transference number (tLi+ = 0.78) and inhibition of lithium dendrite formation on the lithium metal surface.