采用倒相法制备了二次锂电池用的聚偏氟乙烯–六氟丙烯复合聚合物(PVDF-HFP/SiO₂)隔膜，测定了它的吸液率、电导率、机械强度等性能，并通过扫描电镜对其形貌进行了分析。研究结果表明， PVDF-HFP/SiO₂隔膜具有较高的吸液率、电导率和韧性：电解质吸收率达184.4%、
室温电导率为1.20mS/cm、断裂伸长率高达163%。利用PVDF-HFP/SiO2隔膜装配的二次锂电池的首放比容量为834.8mAh/g，第40次的放电比容量达到400mAh/g, 循环效率达到99.8%以上，表现出良好的电化学性能。

A polymer (PVDF-HFP) separator and a composite polymer (PVDF-HFP/SiO₂) separator were prepared by the phase-inversion method. The electrolyte uptake, conductivity and mechanical properties of the separators were studied, and the corresponding micro-structures were examined by SEM. The PVDF-HFP/SiO₂ separator exhibits much higher electrolyte uptake, conductivity and ductibility with an electrolyte uptake volume of 184.4%, a conductivity of 1.2 mS/cm and ductibility of 163%. When the PVDF-HFP/SiO₂ separator is employed in a lithium battery a good cycle performance and a high cycling fficiency are observed. The first discharge specific capacity is 834.8 mAh/g, the 40th cycle discharge capacity is 400 mAh/g and the average charge/discharge efficiency is above 99.8%.