| 摘要 |
A relatively thin planar anode for use in a wet electrolytic capacitor is provided. Through a combination of specific materials and processing techniques, the present inventors have surprisingly discovered that the resulting anode may possess a high volumetric efficiency, and yet still be able to operate at a high voltage and capacitance, thus resulting in a capacitor with a high energy density. More particularly, the anode is a pressed pellet formed from an electrically conductive powder that contains a plurality of particles (including agglomerates thereof). The particles may have a flake-like morphology in that they possess a relatively flat or platelet shape. The present inventors have discovered that such a particle morphology can optimize packing density, and thus reduce the thickness of the anode and improve volumetric efficiency. Such particles can also provide a short transmission line between the outer surface and interior of the anode and also provide a highly continuous and dense wire-to-anode connection with high conductivity. Among other things, this may help increase the specific charge of the anode when anodized at higher voltages, thereby increasing energy density. The particles may also increase the breakdown voltage (voltage at which the capacitor fails) and help lower equivalent series resistance (“ESR”). |
