【摘要】 本工作以聚氧化乙烯（PEO）和氧化铝（Al₂O₃）为原料,利用刮涂法制备了一系列PEO-Al₂O₃复合隔膜,探索了Al₂O₃添加量对PEO-Al₂O₃复合隔膜的性能影响。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线能量色散谱仪（EDS）、X射线衍射仪（XRD）、红外光谱（FTIR）、X射线光电子能谱分析（XPS）、热重分析（TG）及燃烧实验法对复合隔膜的形貌、元素分布、相组成、表面化学状态和热稳定性进行表征。通过线性扫描伏安法（LSV）、电化学交流阻抗法（EIS）、孔隙率测试和吸液率实验考察了复合隔膜的电化学窗口、离子电导率、孔隙率和吸液率。实验结果显示,PEO-Al₂O₃-90复合隔膜具有最高的离子电导率(1. 21×10^-3S/cm)、最大的吸液率（260%）、较好的热稳定性、较高的孔隙率（47%）以及较宽的电化学窗口（0～4. 8 V）。通过组装电池发现,PEO-Al₂O₃-90复合隔膜电池在电流密度为0. 1C时表现出较高的放电比容量、优异的循环稳定性以及较强的安全性。更多还原

【Abstract】 In this work,a series of polyethylene glycol oxide（ PEO）-aluminium oxide（ Al₂O₃） hybrid membranes were prepared by a slurry coating method. The effect of the mass ratio of PEO/Al₂O₃ on the performance of PEO-Al₂O₃ hybrid membranes was systematically investigated.Scanning electron microscopy（ SEM）,transmission electron microscope（ TEM）,X-ray energy dispersive spectroscopy（ EDS）,X-ray diffraction（ XRD）,Fourier transform infrared spectra（ FTIR）,X-ray photoelectron spectroscopy（ XPS）,thermogravimetric analysis（ TG） and combustion test were performed to reveal the morphology,element distribution,phase composition,surface chemical state and thermal stability of PEO-Al₂O₃ hybrid membranes. In addition,linear sweep voltammetry（ LSV）,electrochemical impedance spectroscopy（ EIS）,porosity and electrolyte uptake test were employed to investigate the electrochemical stability,ionic conductivity,porosity and electrolyte uptake of PEO-Al₂O₃ hybrid membranes. The results showed that PEO-Al₂O₃-90 hybrid membrane had a high ionic conductivity（ 1. 21 × 10-3 S/cm）,high electrolyte uptake（ 260%）,good thermal stability,high porosity（ 47%） and wide electrochemical stabilization window（ 0—4. 8 V）. At the current density of 0. 1 C,LiFePO₄| PEO-Al₂O₃-90 | Li cells assembled with PEO-Al₂O₃-90 hybrid membrane exhibited a high discharge specific capacity,superior cycling stability and enhanced safety.更多还原