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A solid electrolytic capacitor that is capable of exhibiting good electrical properties even under the extreme conditions of high temperature and humidity levels is provided. More particularly, the capacitor contains a capacitor element that includes a sintered porous anode body, a dielectric that o

A solid electrolytic capacitor that is capable of exhibiting good electrical properties even under the extreme conditions of high temperature and humidity levels 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 solid electrolyte that overlies the dielectric. The solid electrolyte contains a conductive polymer and an organometallic coupling agent. The capacitor also contains a moisture barrier layer that overlies the solid electrolyte and is formed from a hydrophobic elastomer that has a low surface energy such that it is not readily wettable by an aqueous medium.

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1. A solid electrolytic capacitor comprising: a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, a solid electrolyte that overlies the dielectric, and a moisture barrier layer that overlies the solid electrolyte, wherein the solid electrolyte i

1. A solid electrolytic capacitor comprising: a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, a solid electrolyte that overlies the dielectric, and a moisture barrier layer that overlies the solid electrolyte, wherein the solid electrolyte includes a conductive polymer and an organometallic coupling agent that contains an organic chain with at least one reactive group bonded to a metal atom, and further wherein the moisture barrier layer includes a hydrophobic elastomer, wherein the hydrophobic elastomer is a silicone elastomer, wherein the silicone elastomer is formed from a polydimethylsiloxane, polymethylhydrogensiloxane, dimethyidiphenylpolysiloxane, dimethyl/methylphenylpolysiloxane, polymethylphenylsiloxane, methylphenyl/dimethylsiloxane, vinyldimethyl terminated polydimethylsiloxane, vinylmethyl/dimethylpolysiloxane, vinyldimethyl terminated vinylmethyl/dimethylpolysiloxane, divinylmethyl terminated polydimethylsiloxane, vinylphenylmethyl terminated polydimethylsiloxane, dimethylhydro terminated polydimethylsiloxane, methylhydro/dimethylpolysiloxane, methylhydro terminated methyloctylpolysiloxane, methylhydro/phenylmethyl polysiloxane, fluoro-modified polysiloxane, or a combination thereof;an anode termination that is in electrical connection with the anode body;a cathode termination that is in electrical connection with the solid electrolyte; anda resinous casing that encapsulates the capacitor element and leaves exposed at least a portion of the anode termination and the cathode termination. 2. The solid electrolytic capacitor of claim 1, wherein the organometallic coupling agent is an organosilane. 3. The solid electrolytic capacitor of claim 1, wherein the solid electrolyte contains a layer that includes the organometallic coupling agent and the conductive polymer. 4. The solid electrolytic capacitor of claim 1, wherein the solid electrolyte contains a layer that includes the organometallic coupling agent and another layer that includes the conductive polymer. 5. The solid electrolytic capacitor of claim 1, wherein the hydrophobic elastomer has a contact angle with water of about 90° or more, as determined in accordance with ASTM D7490-08. 6. The solid electrolytic capacitor of claim 1, wherein the hydrophobic elastomer has a water vapor transmission rate of about 150 grams per square meter per 24 hours or less, as determined in accordance with ASTM F-1249. 7. The solid electrolytic capacitor of claim 1, wherein the hydrophobic elastomer has a Young's modulus of about 5,000 kilopascals or less, determined at a temperature of about 25° C. 8. The solid electrolytic capacitor of claim 1, wherein the hydrophobic elastomer has a tensile strength of from about 1 to about 5,000 kilopascals, determined at a temperature of about 25° C. 9. The solid electrolytic capacitor of claim 1, wherein the anode body includes tantalum and the dielectric includes tantalum pentoxide. 10. The solid electrolytic capacitor of claim 1, wherein the conductive polymer is chemically polymerized. 11. The solid electrolytic capacitor of claim 1, wherein the conductive polymer is a substituted polythiophene. 12. The solid electrolytic capacitor of claim 11, wherein the substituted polythiophene is poly(3,4-ethylenedioxythiophene). 13. The solid electrolytic capacitor of claim 1, wherein a cathode coating overlies the solid electrolyte, the cathode coating containing a carbonaceous layer and silver layer. 14. The solid electrolytic capacitor of claim 1, wherein an anode lead extends from the anode body and is connected to the anode termination. 15. A solid electrolytic capacitor comprising: a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, a solid electrolyte that overlies the dielectric, and a moisture barrier layer that overlies the solid electrolyte, wherein the solid electrolyte includes a conductive polymer and an organometallic coupling agent that contains an organic chain with at least one reactive group bonded to a metal atom, and further wherein the moisture barrier layer includes a hydrophobic elastomer, wherein the moisture barrier layer contains a non-conductive filler, wherein the non-conductive filler is silica, wherein the silica contains (CH3)n—Si— groups, wherein n is an integer of 1 to 3;an anode termination that is in electrical connection with the anode body;a cathode termination that is in electrical connection with the solid electrolyte; anda resinous casing that encapsulates the capacitor element and leaves exposed at least a portion of the anode termination and the cathode termination. 16. The solid electrolytic capacitor of claim 15, wherein the organometallic coupling agent is an organosilane. 17. The solid electrolytic capacitor of claim 15, wherein the solid electrolyte contains a layer that includes the organometallic coupling agent and the conductive polymer. 18. The solid electrolytic capacitor of claim 15, wherein the solid electrolyte contains a layer that includes the organometallic coupling agent and another layer that includes the conductive polymer. 19. The solid electrolytic capacitor of claim 15, wherein the hydrophobic elastomer has a contact angle with water of about 90° or more, as determined in accordance with ASTM D7490-08. 20. The solid electrolytic capacitor of claim 15, wherein the hydrophobic elastomer has a water vapor transmission rate of about 150 grams per square meter per 24 hours or less, as determined in accordance with ASTM F-1249. 21. The solid electrolytic capacitor of claim 15, wherein the hydrophobic elastomer has a Young's modulus of about 5,000 kilopascals or less, determined at a temperature of about 25° C. 22. The solid electrolytic capacitor of claim 15, wherein the hydrophobic elastomer has a tensile strength of from about 1 to about 5,000 kilopascals, determined at a temperature of about 25° C. 23. The solid electrolytic capacitor of claim 15, wherein the anode body includes tantalum and the dielectric includes tantalum pentoxide. 24. The solid electrolytic capacitor of claim 15, wherein the conductive polymer is chemically polymerized. 25. The solid electrolytic capacitor of claim 15, wherein the conductive polymer is a substituted polythiophene. 26. The solid electrolytic capacitor of claim 25, wherein the substituted polythiophene is poly(3,4-ethylenedioxythiophene). 27. The solid electrolytic capacitor of claim 15, wherein a cathode coating overlies the solid electrolyte, the cathode coating containing a carbonaceous layer and silver layer. 28. The solid electrolytic capacitor of claim 15, wherein an anode lead extends from the anode body and is connected to the anode termination.