【摘要】 采用非溶剂致相转化法（NIPS）制备了热塑性聚氨酯/醋酸纤维素/氧化铝（TPU/CA/Al₂O₃）新型复合聚合物电解质（CPE）。通过添加不同比例的Al₂O₃来控制多孔膜的结构与性能。用X射线衍射光谱分析（XRD）、扫描电子显微镜（SEM）、热重分析（TG）、电化学阻抗（EIS）和线性扫描伏安法（LSV）等对制备的TPU/CA/Al₂O₃复合膜进行了表征。结果表明,当Al₂O₃的含量达到9%时,膜的电化学性能最佳。该CPE在室温下的离子电导率为1.61 mS/cm,远高于TPU/CA膜（1.04 mS/cm）。该CPE的电化学窗口达到7 V （vs.Li/Li⁺）以上。与TPU/CA膜相比,该CPE膜的LiFePO₄/CPE/Li纽扣电池在室温下具有良好的循环稳定性和速率性能。这表明,TPU/CA/Al₂O₃CPE有很大的潜能应用于5 V高压锂离子电池（LIB）中。更多还原

【Abstract】 A new composite polymer electrolyte（CPE） based on thermoplastic poly urethane/cellulose acetate/aluminium oxide（TPU/CA/Al₂O₃） blended polymer was prepared by non-solvent induced phase separation（NIPS）.The structure and properties of the porous membrane were controlled by the addition of A1203.The performance of the membranes with different ratios of A1203 to TPU/CA were characterized by X-ray diffraction spectroscopy（XRD）,scan electron microscopy（SEM）,thermogravimetric analysis（TG）,electrochemical impedance spectroscopy（EIS） and linear sweep voltammetry（LSV）.The results show when the ratio of Al₂O₃ achieves 9%,the membrane presents the best electrochemical performance.The ionic conductivity of this CPE is 1.61 mS/cm,which is much higher than the TPU/CA membrane（1.04 mS/cm） at room temperature.The electrochemical window of this CPE establishes over 7 V（vs.Li/Li⁺）.The LiFePO₄/CPE/Li coin cell with this CPE displays excellent cyclic stability and rate performance at room temperature comparing with TPU/CA membrane.This suggests that TPU/CA/A1203 blended CPE has a high potential for 5 V highvoltage lithium-ion batteries（LIBs）.更多还原