Characterization of tantalum oxide-ruthenium oxide hybrid capacitors

Author

Chang, Tzu-Yen ; Wang, Xu ; Evans, David A. ; Roberson, S.L. ; Zheng, Jim P.

Author_Institution

Dept. of Electr. & Comput. Eng., Florida A&M Univ., Tallahassee, FL, USA

Volume

51

Issue

6

fYear

2004

Firstpage

1313

Lastpage

1317

Abstract

The ac and dc performance and leakage current of Evans tantalum oxide-ruthenium oxide hybrid capacitors were characterized at room temperature. The RC time constants were in the range from 2 to 0.45 ms and dependent on the maximum operational voltage of the capacitor. The gravimetric and volumetric energy densities of hybrid capacitors were in the range of 0.074-0.233 J/g and 0.388-1.384 J/cm³, respectively. The gravimetric and volumetric power densities of hybrid capacitors were in the range of 19-259 W/g and 100-1540 W/cm³, respectively. A comparison of the performance between hybrid capacitors to conventional aluminum and tantalum electrolytic capacitors is made in this paper.

Keywords

capacitors; electric impedance; leakage currents; ruthenium compounds; tantalum compounds; 0.45 to 2 ms; AC impedance; RC time constants; RuO₂; TaO₂; gravimetric energy densities; hybrid capacitors; leakage current; room temperature; ruthenium oxide; tantalum oxide; volumetric energy densities; Aluminum; Anodes; Breakdown voltage; Capacitance; Capacitors; Cathodes; Dielectrics; Electrodes; Hybrid power systems; Leakage current; 65; AC impedance; hybrid capacitors; ruthenium oxide; tantalum oxide;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2004.837900

Filename

1360071