铝固体聚合物电容器是用于电力电子应用的增加的需求的有前途的设备。尽管如此,市售催化剂的低击穿电压(~100V)限制了它们的应用。在这项研究中,在85°C的硼酸中,在700V下对氢氧化物膜覆盖的高纯度铝进行阳极氧化,并研究了阳极氧化后第二次热水浸泡(正电处理)对击穿电压的影响,作为可能的未来处理,以提高固体电解电容器的耐压。带PEDOT:PSS涂层的阳极氧化铝的介电击穿电压为〜500V,比阳极氧化电压低200伏;然而,由于在介电氧化铝膜上方形成纳米空隙层,通过引入正演处理,介电击穿电压增加到700V以上。我们的研究表明,与PEDOT:PSS结合的高度分散的纳米空隙避免了某些局部区域的电流浓度,有效提高介电击穿电压。通过在电介质膜中引入物理缺陷,后掺杂处理增加了漏电流。然而,在PEDOT:PSS涂层或涂层之前的第二阳极氧化过程之后,通过电压扫描将泄漏电流降低到击穿电压以下,将击穿电压保持在600V以上。在我们的研究中发现的获得具有高耐压(600V)的铝固体电容器的有前途的加工路线是,首先,浸入热水;第二,在700V下进行阳极氧化;然后进行第二次热水处理;在400V下进行第二次阳极氧化,这保持电容不变,击穿电压增强。
Aluminum solid polymer capacitors are promising devices for the increased demand for power electronics applications. Nonetheless, the low breakdown voltage of commercially available catalysts (∼100 V) limits their applications. In this study, a hydroxide-film-covered high-purity aluminum was anodized at 700 V in boric acid at 85 °C, and the effect of a second hot water immersion (posthydration treatment) after
anodizing on the breakdown voltage was studied as a possible future treatment to enhance the withstand voltages of solid electrolytic capacitors. The dielectric breakdown voltage of the anodized aluminum with a PEDOT:PSS coating was ∼500 V, being ∼200 V less than the
anodizing voltage; however, the dielectric breakdown voltage was increased above 700 V by introducing the posthydration treatment due to the formation of a nanovoid layer above the dielectric alumina film. Our research suggests that the highly dispersed nanovoids incorporated with PEDOT:PSS avoid the current concentration at some local regions, effectively increasing the dielectric breakdown voltage. The posthydration treatment increased the leakage current by introducing physical defects in the dielectric film. However, the leakage current was reduced by a voltage sweep below the breakdown voltage after the PEDOT:PSS coating or a second
anodizing process before the coating, keeping the breakdown voltage above 600 V. A promising processing route to obtain aluminum solid capacitors with high withstand voltage (600 V) found in our research is, first, dipping in hot water; second,
anodizing at 700 V; then a second hot water treatment; and a second
anodizing at 400 V, which keeps the capacitance invariable with a breakdown voltage enhanced.