Solid electrolytic capacitor with improved leakage current
AssigneeAVX Corporation
InventorsJan Petrzilek, Miloslav Uher, Tomas Horfirek
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Abstract
A capacitor assembly that is capable of exhibiting good electrical properties even under a variety of conditions is provided. More particularly, the capacitor contains a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, and a pre-coat layer that overlies the dielectric and is formed from an organometallic compound. A solid electrolyte overlies the pre-coat layer that contains an inner layer and an outer layer, wherein the inner layer is formed from an in situ-polymerized conductive polymer and the outer layer is formed from pre-polymerized conductive polymer particles.
Claims27
A capacitor assembly comprising a capacitor element, the capacitor element comprising:
- a sintered porous anode body;
- a dielectric that overlies the anode body;
- a pre-coat layer that overlies the dielectric that is formed from an organometallic compound;
- a solid electrolyte that overlies the pre-coat layer, wherein the solid electrolyte contains an inner layer and an outer layer, wherein the inner layer is formed from an in situ-polymerized conductive polymer and the outer layer is formed from pre-polymerized conductive polymer particles, and wherein the inner layer is formed with an oxidative catalyst that includes transition metal cations.
A method for forming a capacitor assembly, the method comprising:
- anodically oxidizing a sintered porous anode body to form an anode;
- applying a solution to the anode that includes an organometallic compound having the following general formula:
- wherein,
- M is an organometallic atom;
- r1, r2, and r3 are independently an alkyl or a hydroxyalkyl, wherein at least one of R1, R2, and R3 is a hydroxyalkyl;
- n is an integer from 0 to 8;
- X is an organic or inorganic functional group;
- polymerizing a conductive polymer precursor monomer in the presence of an oxidative catalyst that includes transition metal cations to form an inner solid electrolyte layer that overlies the pre-coat layer;
- and
- applying a dispersion of conductive polymer particles to form an outer solid electrolyte layer that overlies the inner solid electrolyte layer.
Dependencies are inferred from the claim text.