聚乙烯醇/硅酸镁锂碱性电池隔膜制备及表征

Preparation and characterization of composite alkaline polymer membrane based on PVA-lithium magnesium silicate

用溶液浇铸法制备含有聚乙烯醇(PVA)/硅酸镁锂(MLS)的有机无机复合碱性电池隔膜。采用扫描电镜、交流阻抗技术研究(PVA)/MLS复合隔膜的特性。在室温时(23℃),PVA/MLS复合隔膜离子电导率最高可达4.6×10-2S/cm。以PVA/MLS复合隔膜为隔膜组装氢镍电池,当以1倍率充放电时,在1.10～1.25 V有放电平台出现,电池经过300个循环后,放电效率仍然有91%,表明聚PVA/MLS复合隔膜的电化学性能很稳定。

An organic-inorganic composite polymer membranes composed of poly （vinyl alcohol）（PVA）, lithium magnesium silicate （MLS） were prepared by a solution casting method. The organic-inorganic composite polymer membranes of PVA- MLS were characterized by SEM and EIS technology. The highest electrical conductivity reaches 0.046 S/cm at room temperature （23℃ ）for the composite membrane. The discharge voltage plateau of 1.1-1.25 V at 1 C was observed for the Ni/MH cell with the PVN MLS composite membrane. After 300 circles at 1 C, the charge-discharge efficiency is 91%. These results indicate that the membranes exhibit good stability