SiO2纳米纤维复合PEO基固态电解质制备及锂电池电化学性能OA

The S-PEO/LiTFSI composite solid-state electrolyte was constructed via integration of flex-ible SiO2 nanofiber membranes with a PEO/LiTFSI matrix through solution coating,demonstrated significant enhancements in thermomechanical properties:tensile strength(1.50 MPa)and elongation at break(21％)surpassed the PEO/LiTFSI counterpart(1.02 MPa,18％),concomitant with an el-evated melting transition temperature(55.1℃ vs.50.5℃).Electrochemical characterization re-vealed a room temperature ionic conductivity of 1.3×10-4S/cm at 30℃—representing a tenfold im-provement over the control—with reduced activation energy(0.712 eV vs.0.952 eV).Performance evaluation demonstrated:Li‖S-PEO/LiTFSI‖Li symmetric cells maintained voltage hysteresis stabil-ity(24.8±0.2)mV through 1 100 cycles at 60℃;LiFePO4‖S-PEO/LiTFSI‖Li full cells exhibited sub-stantially diminished overpotentials(44 mV@0.1 C,59 mV@0.2 C vs.99 mV,141 mV control)while delivering discharge capacities of 127 mAh/g@0.8 C and 100 mAh/g@1 C.These improvements are attributed to the three-dimensional SiO2 network,which enhances ion transport pathways,provides mechanical reinforcement,and optimizes electrode-electrolyte interfacial stability.