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An electrolytic capacitor containing a protective adhesive layer positioned between the dielectric layer and the solid electrolyte layer (e.g., a conductive polymer layer, manganese dioxide) is generally disclosed. The protective adhesive layer can include a polymer having a repeating unit with a fu

An electrolytic capacitor containing a protective adhesive layer positioned between the dielectric layer and the solid electrolyte layer (e.g., a conductive polymer layer, manganese dioxide) is generally disclosed. The protective adhesive layer can include a polymer having a repeating unit with a functional hydroxyl group, such as poly(vinyl alcohol). For instance, the polymer can be at least 90 mole % hydrolyzed. The polyvinyl alcohol can be a co-polymer of vinyl alcohol and a monomer, such as an acrylic ester like a methacrylic ester (e.g., methyl methacrylate).

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What is claimed is: 1. A solid electrolytic capacitor comprising: an anode; a dielectric layer overlying the anode; a protective adhesive layer overlying the dielectric layer, wherein the protective adhesive layer comprises a polymer having a repeating unit with a functional hydroxyl group, wherein

What is claimed is: 1. A solid electrolytic capacitor comprising: an anode; a dielectric layer overlying the anode; a protective adhesive layer overlying the dielectric layer, wherein the protective adhesive layer comprises a polymer having a repeating unit with a functional hydroxyl group, wherein the polymer has a degree of hydrolysis of at least about 90 mole %; and a solid electrolyte layer overlying the protective adhesive layer. 2. A solid electrolytic capacitor as in claim 1, wherein the polymer comprises a hydrophilic polymer. 3. A solid electrolytic capacitor as in claim 1, wherein the polymer has a degree of hydrolysis of at least about 95 mole %. 4. A solid electrolytic capacitor as in claim 1, wherein the polymer is poly(vinyl alcohol) or a copolymer thereof. 5. A solid electrolytic capacitor as in claim 1, wherein the protective adhesive layer further comprises an acrylate, methacrylate, or a combination thereof. 6. A solid electrolytic capacitor as in claim 1, wherein the protective adhesive layer has a resistivity of greater than about 5 ohm-cm. 7. A solid electrolytic capacitor as in claim 1, wherein the protective adhesive layer has a resistivity of greater than about 1000 ohm-cm. 8. A solid electrolytic capacitor as in claim 1, wherein the protective adhesive layer has a thickness of about 50 micrometers or less. 9. A solid electrolytic capacitor as in claim 1, wherein the solid electrolyte layer comprises a conductive polymer. 10. A solid electrolytic capacitor comprising: an anode; a dielectric layer overlying the anode; a protective adhesive layer overlying the dielectric layer, wherein the protective adhesive layer comprises a polymer having a repeating unit with a functional hydroxyl group; and a solid electrolyte layer overlying the protective adhesive layer, wherein the solid electrolyte layer comprises a conductive polymer, and wherein the conductive polymer is polymerized in the presence of less than a stoichiometric amount of the oxidative polymerization catalyst. 11. A solid electrolytic capacitor as in claim 1, further comprising a barrier layer overlying the solid electrolyte layer. 12. A solid electrolytic capacitor as in claim 1, wherein the anode contains a valve metal. 13. A solid electrolytic capacitor as in claim 12, wherein the anode contains tantalum or a niobium oxide. 14. A solid electrolytic capacitor as in claim 10, wherein the polymer has a degree of hydrolysis of at least about 90 mole %. 15. A solid electrolytic capacitor as in claim 10, wherein the polymer has a degree of hydrolysis of at least about 95 mole %. 16. A solid electrolytic capacitor as in claim 10, wherein the polymer is poly(vinyl alcohol) or a copolymer thereof. 17. A solid electrolytic capacitor as in claim 10, wherein the protective adhesive layer further comprises an acrylate, methacrylate, or a combination thereof. 18. A solid electrolytic capacitor as in claim 10, wherein the protective adhesive layer has a resistivity of greater than about 5 ohm-cm. 19. A solid electrolytic capacitor as in claim 10, wherein the protective adhesive layer has a resistivity of greater than about 1000 ohm-cm. 20. A solid electrolytic capacitor as in claim 10, wherein the protective adhesive layer has a thickness of about 50 micrometers or less. 21. A solid electrolytic capacitor as in claim 10, further comprising a barrier layer overlying the solid electrolyte layer. 22. A solid electrolytic capacitor as in claim 10, wherein the anode contains a valve metal. 23. A solid electrolytic capacitor as in claim 22, wherein the anode contains tantalum or a niobium oxide. 24. A solid electrolytic capacitor comprising: an anode containing a valve metal; a dielectric layer overlying the anode; a protective adhesive layer overlying the dielectric layer, wherein the protective adhesive layer comprises a vinyl alcohol copolymer, wherein the vinyl alcohol copolymer is at least 90 mole % hydrolyzed; and a solid electrolyte layer overlying the protective adhesive layer. 25. A solid electrolytic capacitor as in claim 24, wherein the vinyl alcohol co-polymer is formed from a monomer that includes an acrylic ester, methacrylic ester, or a combination thereof. 26. A solid electrolytic capacitor as in claim 24, wherein the protective adhesive layer has a resistivity of greater than about 5 ohm-cm. 27. A solid electrolytic capacitor as in claim 24, wherein the protective adhesive layer has a thickness of about 50 micrometers or less. 28. A solid electrolytic capacitor as in claim 24, wherein the solid electrolyte layer comprises a conductive polymer. 29. A solid electrolytic capacitor as in claim 24, wherein the anode contains tantalum or a niobium oxide. 30. A solid electrolytic capacitor comprising: an anode; a dielectric layer overlying the anode; a protective adhesive layer overlying the dielectric layer, wherein the protective adhesive layer comprises a polymer having a repeating unit with a functional hydroxyl group, wherein the polymer is a vinyl alcohol co-polymer formed from a monomer that includes an acrylic ester, methacrylic ester, or a combination thereof; and a solid electrolyte layer overlying the protective adhesive layer, wherein the solid electrolyte layer comprises a conductive polymer. 31. A solid electrolytic capacitor as in claim 30, wherein the monomer comprises methyl methacrylate. 32. A solid electrolytic capacitor as in claim 30, wherein the polymer has a degree of hydrolysis of at least about 90 mole %. 33. A solid electrolytic capacitor as in claim 30, wherein the polymer has a degree of hydrolysis of at least about 95 mole %. 34. A solid electrolytic capacitor as in claim 30, wherein the protective adhesive layer further comprises an acrylate, methacrylate, or a combination thereof. 35. A solid electrolytic capacitor as in claim 30, wherein the protective adhesive layer has a resistivity of greater than about 5 ohm-cm. 36. A solid electrolytic capacitor as in claim 30, wherein the protective adhesive layer has a resistivity of greater than about 1000 ohm-cm. 37. A solid electrolytic capacitor as in claim 30, wherein the protective adhesive layer has a thickness of about 50 micrometers or less. 38. A solid electrolytic capacitor as in claim 30, wherein the solid electrolyte layer comprises a conductive polymer. 39. A solid electrolytic capacitor as in claim 30, wherein the conductive polymer is polymerized in the presence of less than a stoichiometric amount of the oxidative polymerization catalyst. 40. A solid electrolytic capacitor as in claim 30, further comprising a barrier layer overlying the solid electrolyte layer. 41. A solid electrolytic capacitor as in claim 30, wherein the anode contains a valve metal. 42. A solid electrolytic capacitor as in claim 41, wherein the anode contains tantalum or a niobium oxide.