高比容铝电解电容器关键技术进展

简述了铝电解电容器的国内外发展现状,评述了近年来铝电解电容器用高介电常数复合阳极氧化膜及工作电解液的研究进展,指出了相关的技术难点和存在问题,探讨了高比容铝电解电容器的未来技术发展趋势。

Progress in the Key Technologies for the Fabrication of High Specific Capacitance of Aluminum Electrolytic Capacitors

The worldwide market for aluminum electrolytic capacitors (Al E-caps) was about USD 4.805 billion in 2004, among which the production in China took approximately 40%. Besides, the Al E-cap market in China continues to grow by over 15% per year due to the increased demands from IC and ISI devices. This paper carries out a brief survey on the key technologies for the fabrication of high specific capacitance of Al E-caps. The recent development in both composite alumina films with high dielectric constant and working electrolytes for Al E-caps is discussed in detail, jncluding related technological difficulties and problems. Three different methods to manufacture alumina composite films with high dielectric constants, the sol-gel coating, hydrolysis precipitation and electrophoretic precipitation, are reviewed. Commonly-used solvents, solutes and additives in the working electrolyte for Al E-caps and their performances are analyzed in this paper. Solid electrolytes, including organic semiconductive electrolytes 7,7,8,8-tetracyanoquinodimethan (TCNQ) and its complex salts, and conducting polymers, such as polypyrrole, polyaniline and poly(3,4-ethylenedioxytiophene) are compared. Some ionic liquids, a new type of electrolyte applied for V-chip Al E-caps, are also discussed. The future trends on high specific capacitance of Al E-cap are proposed.