Identification of Al-dtpa-PO4 Ternary Complex Inhibiting Hydration of Alumina Electrodes in Electrolytic Capacitors
Identification of Al-dtpa-PO4 Ternary Complex Inhibiting Hydration of Alumina Electrodes in Electrolytic Capacitors
复制标题
Al-dtpa-PO4三元配合物抑制电解电容器氧化铝电极水化的鉴定
DOI：
10.1002/celc.201300098
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发表时间：
2014
期刊：
影响因子：
4
通讯作者：
and Makoto Tadokoro*
中科院分区：
文献类型：
--
作者：
Masashi Ozawa;Naoto Kawayauchi;Yoko Mishima;Ayako Sugiue;Mizuho Ueno;Kyosuke Isoda;Masao Sakakura;Tomoaki Sugaya;and Makoto Tadokoro*
铝电解电容器是电力存储设备，是电子设备的重要部件，主要用于滤波，旁路和耦合等功能。[1，2]为了生产具有短响应时间的高性能电容器，通常采用具有低内阻的水基电解液。[3]然而，在没有氧化铝电极表面的保护的情况下，电容性能通常在早期阶段由于水合而损失，这是由氧化铝电极的高水解反应性引起的。[4-6]因此，水分子与氧化铝反应形成氢氧化物，在较高温度下释放氢气并破坏绝缘氧化铝层。这会导致耐电压迅速衰减，漏电流增加，最终导致电容器爆炸。覆盖在氧化铝电极表面的磷酸根离子单层有助于有效的水合抑制，[7]但很难长时间保持单层，因为单层在1058 ℃左右的温度下会被破坏。有机酸如氨基聚羧酸酯H5 dtpa（dtpa=二亚乙基三胺-N，N，N ′，N ″，N ″-五乙酸，方案1），
Aluminum electrolytic capacitors, being devices for the storage of electricity, are essential parts of electronic equipment and are mainly used for functions such as filtering, bypassing and coupling.[1, 2] To produce high-performance capacitors with a short response time, a water-based electrolytic solution having low internal resistance is usually employed.[3] However, without protection of the alumina electrode surface, the capacitive performance is generally lost at an early stage by hydration, which is caused by the high hydrolytic reactivity of the alumina electrode.[4–6] Thus, water molecules react with the alumina to form hydroxide compounds, releasing hydrogen gas at higher temperatures and destroying the insulating alumina layer. This causes a rapid decay in voltage endurance, an increase in leakage current, and, finally, explosion of the capacitor.A phosphate ion monolayer that covers the alumina electrode’s surface facilitates effective hydration inhibition,[7] but maintaining the monolayer for long is difficult because the monolayer is destroyed at temperatures around 1058C. An organic acid such as the amino-polycarboxylate H5dtpa (dtpa= diethylenetriamine-N, N, N’, N’’, N’’-pentaacetic acid, Scheme 1),