Ta-Ta2O5-电解液体系界面导电特性的分析与研究

分析了钽电解电容器阳极氧化膜的形成过程,测试了阳极氧化膜工作的伏安特性。实验表明,阳极氧化膜在电场作用下具有整流效应,O2-跃过氧化膜/电解液界面位垒,在氧化膜中形成定向迁移,同时引发介质膜内二次电子的场助发射是该体系的主要导电机理。电解液中添加适量有机物可使电解液的闪火电压提高40 V以上,这有助于提高液体钽电解电容器的性能,扩大其应用范围。

Analysis and Research on the Dielectric Properties of Ta-Ta2O5-Electrolyte System

Formation process of anodic oxide film of wet tantalum electrolytic capacitors is analyzed,and the I-U character of oxide film is tested.The results show that the tantalum anodic film has valve effect under the out electric field,and the main conductive mechanism of Ta-Ta2O5-electrolyte system is the single direction moving of O2-through the interface energy barrier between the oxide filme and electrolyte,and leading to the emitting of second electronic as well.The sparking voltage of electrolyte will be increased by about 40 V as adding some organic matter into it,which will be help to improve the performance of wet tantalum electrolytic capacitors,and enlarge its application range.