Multi-Notched Anode for Electrolytic Capacitor

摘要

A solid electrolytic capacitor that includes an anode body, a dielectric overlying the anode body, a solid electrolyte that contains one or more conductive polymers and overlies the dielectric, and an external coating that overlies the solid electrolyte, is provided. The external coating includes at least one carbonaceous layer and at least one metal layer. In addition to the aforementioned layers, the external coating can also include at least one conductive polymer layer that can be disposed between the carbonaceous and metal layers. Among other things, such a conductive polymer layer can reduce the likelihood that the carbonaceous layer will delaminate from the solid electrolyte during use. Further, the notched geometry of the anode body itself is selected to minimize the risk of delamination of the external coating layers from the anode body. This combination of characteristics can increase the mechanical robustness of the part and improve its electrical performance.

主权项

1. A solid electrolytic capacitor that comprises a capacitor element, the capacitor element comprising:
a sintered, porous anode body having a plurality of notches located on one or more exterior surfaces of the anode body, wherein each notch is defined by a first wall and an opposing second wall, further wherein each notch has a depth of from about 0.050 millimeters to about 0.250 millimeters; a dielectric overlying the anode body; a solid electrolyte overlying the dielectric, wherein the solid electrolyte contains a first conductive polymer layer; and an external coating that overlies the solid electrolyte and contains a carbonaceous layer and a metal layer that overlies the carbonaceous layer.