Ta-Ta2O5-电解液导电体系界面特性的实验研究  

Study on Interface Properties of Ta-Ta_2O_5-Electrolyte System

作　　者：陆胜[1] 蒋春强 潘平华 陈红征[1] 

机构地区：[1]浙江大学材料与化学工程学院,杭州310027 [2]中国振华集团新云电子元器件有限责任公司,贵阳550018

出　　处：《材料导报》2008年第1期118-120,共3页Materials Reports

基　　金：国家自然科学基金项目(60371028)

摘　　要：分析了阀金属钽氧化膜的形成过程,伏安特性测试结果表明Ta-Ta_2O_5-电解液体系具有单向导电性。电场作用下,电解液中O^(2-)跃过氧化膜/电解液界面,在氧化膜中形成定向迁移,同时引发膜内二次电子场助发射是该体系的主要导电机理。实验表明,大量二次电子导致介质膜雪崩式击穿是该体系闪火的主要原因,在电解液中添加适量有机物,可以屏蔽O^(2-)使电解液的闪火电压提高30V以上,从而提高液体钽电解电容器的性能。The formation process of anodic oxide film of wet tantalum electrolytic capacitors is analyzed and the I-U character test shows that the Ta-Ta2O5-electrolyte system has single direction conductivity. The main conducting mechanism of Ta-Ta2O5 electrolyte system is the single direction moving of O^2- on the oxide film/electrolyte interface, leading to the second electronic emitting as well. The sparking voltage of the electrolyte will be increased by above 30V just by adding some organic matters into it, which will be helpful to improving the performance of wet tantalum electrolvtic capacitors.

关 键 词：阳极氧化膜 介电特性 整流效应 闪火电压 

分 类 号：TM535.1[电气工程—电器]