低压铝电解电容器用腐蚀化成箔构效关系研究

Structure-property relationship of anode foil for low-voltage aluminum electrolytic capacitor

本文利用SEM表征了低压铝电解电容器用高比容腐蚀箔的结构,采用立方孔模型建立了低压腐蚀化成箔的结构-性能关系,并通过压汞仪测试对所建模型进行验证。SEM结果表明,低压腐蚀箔呈现海绵状结构,蚀坑保持立方型孔洞。在实用情况下,对于22. 4 V化成电压,最适孔径为0. 20~0. 24μm,最大比容为(185. 3~227. 6)×10^-6F·cm^-2。压汞仪测试结果表明,建立的立方孔洞模型可以反映低压腐蚀箔结构特征。

The structure of low-voltage etching foil with high specific capacitance for aluminum electrolytic capacitor was characterized by SEM,and then a cubic pit model was adopted to study the structure-property relationship of the foil. The so-built model was verified by the mercury porosimetry. The results show that the etching foil has a sponge like cubic pit structure. The optimal diameter and maximum capacitance at forming voltage of 22. 4 V for practical application is 0. 20-0. 24μm and( 185. 3-227. 6) × 10^-6 F·cm^-2,respectively. Furthermore,the mercury porosimetry result shows that the cubic pit model can reflect the structural characteristic of low-voltage etching foil.