Solid Electrolytic Capacitor with Improved Performance at High Voltages
First Claim
1. A solid electrolytic capacitor comprising:
- a sintered porous anode that is formed from a finely divided powder having a specific charge of greater than about 30,000 μ
F*V/g, wherein the powder contains particles having a three-dimensional shape;
a dielectric layer that overlies the anode body; and
a solid electrolyte overlying the dielectric layer, wherein the solid electrolyte comprises a plurality of pre-polymerized conductive polymer particles,wherein the capacitor exhibits a breakdown voltage of about 60 V or more.
2 Assignments
0 Petitions
Accused Products
Abstract
A solid electrolytic capacitor that comprises a sintered porous anode, a dielectric layer that overlies the anode body, and a solid electrolyte overlying the dielectric layer is provided. The anode is formed from a finely divided powder (e.g., nodular or angular) having a relatively high specific charge. Despite the use of such high specific charge powders, high voltages can be achieved through a combination of features relating to the formation of the anode and solid electrolyte. For example, relatively high press densities and sintering temperatures may be employed to achieve “sinter necks” between adjacent agglomerated particles that are relatively large in size, which render the dielectric layer in the vicinity of the neck less susceptible to failure at high forming voltages.
-
Citations
25 Claims
-
1. A solid electrolytic capacitor comprising:
-
a sintered porous anode that is formed from a finely divided powder having a specific charge of greater than about 30,000 μ
F*V/g, wherein the powder contains particles having a three-dimensional shape;a dielectric layer that overlies the anode body; and a solid electrolyte overlying the dielectric layer, wherein the solid electrolyte comprises a plurality of pre-polymerized conductive polymer particles, wherein the capacitor exhibits a breakdown voltage of about 60 V or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method for forming a solid electrolytic capacitor, the method comprising:
-
pressing a finely divided powder into the form of a pellet, wherein the powder has a specific charge of greater than about 30,000 μ
F*V/g and contains particles having a three-dimensional shape;sintering the pellet; anodically oxidizing the sintered pellet to form a dielectric layer that overlies the anode; and applying a dispersion of pre-polymerized conductive polymer particles to the dielectric layer. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
-
Specification