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    • 1. 发明申请
    • Anodizing Electrolytes Using A Dual Acid System For High Voltage Electrolytic Capacitor Anodes
    • 用高电压电解电容阳极的双酸性阳极氧化电解质
    • US20070221507A1
    • 2007-09-27
    • US11677342
    • 2007-02-21
    • Yanming LiuDavid GoadDavid BudekChristina Scheuer
    • Yanming LiuDavid GoadDavid BudekChristina Scheuer
    • C25D9/00
    • C25D11/26A61N1/3975C25D11/024C25D11/08H01G9/0032
    • An improved formation electrolyte and method for anodizing valve metal anodes used in electrolytic capacitors, particularly for high voltage sintered tantalum powder anode, is described. The anodizing electrolyte composition is comprised of 1) a phosphorus oxyacid and/or its salt, such as phosphoric acid and ammonium phosphate; 2) a weak inorganic acid/salt (such as boric acid, ammonium borate) or a weak carboxylic acid/salt; 3) water; and 4) a protic solvent or a mixture of two or more protic solvents. The weak mono-carboxylic acid/salt has 2 to 7 carbon atoms and the weak di- or poly-carboxylic acid/salt has 3 to 13 carbon atoms. The present electrolytes have high anodizing breakdown voltage capability and the formed dielectric oxides have improved oxide quality including good oxide hydration resistant ability, and result in more stable capacitor performance. These properties are particularly important for critical applications such as implantable cardioverter defibrillators (ICDs). Significantly, this means that fewer capacitors are needed to meet an ICD's operating voltage.
    • 描述了用于阳极氧化用于电解电容器中的阀金属阳极,特别是用于高压烧结钽粉末阳极的改进的地层电解质和方法。 阳极氧化电解质组合物包括1)磷酸和/或其盐如磷酸和磷酸铵; 2)弱无机酸/盐(如硼酸,硼酸铵)或弱羧酸/盐; 3)水; 和4)质子溶剂或两种或更多种质子溶剂的混合物。 弱单羧酸/盐具有2至7个碳原子,弱二羧酸/多羧酸/盐具有3至13个碳原子。 本发明的电解质具有高的阳极氧化击穿电压能力,并且形成的电介质氧化物具有改善的氧化物质量,包括良好的氧化物水合抗性能,并且导致更稳定的电容器性能。 这些特性对于诸如植入式心律转复除颤器(ICD)等关键应用尤其重要。 重要的是,这意味着需要更少的电容来满足ICD的工作电压。