A dual-layer micro/nanostructured fibrous membrane with enhanced ionic conductivity for lithium-ion battery

摘要: Abstract Electrospun fiber-based composite membrane with interconnected porous structure has drawn significant attention for application in lithium-ion battery (LIB) owing to its high ion transportation. Here, we report a facile approach fabricate the hierarchically micro/nanostructured ultrathin SiO2-PAN skin layer on PAN-PU fibrous surface via electrospinning and sequential electrospraying techniques. Benefiting from synergistic effect of micro/nanostructure superior electrolyte affinity layer, as-prepared SiO2-PAN@PAN-PU demonstrates decreased pore size (1.18 μm), enhanced ionic conductivity (1.4 mS cm−1) robust electrochemical stability up 5.08 V. Moreover, introduction endows improved stress strength (15.7 MPa) excellent thermostability 200 °C. Compared Celgard membranes, dual-layer based Li/LiFePO4 cell assembled mass-loading LiFePO4 more stable cycling lifetime discharge capacity (107.4 mAh g−1 at 105th cycles) higher rate capability (75.2 mAh 1 C). The strategy using technique demonstrated this work will open door narrow enhance potential high-power LIB.