External coating for a solid electrolytic capacitor
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01G-009/04
H01G-009/145
출원번호
US-0604633
(2009-10-23)
등록번호
US-8125768
(2012-02-28)
발명자
/ 주소
Horacek, Ivan
Petrzilek, Jan
출원인 / 주소
AVX Corporation
대리인 / 주소
Dority & Manning, P.A.
인용정보
피인용 횟수 :
6인용 특허 :
44
초록▼
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
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 (e.g., graphite) and at least one metal layer (e.g., silver). In addition to the aforementioned layers, the external coating also includes at least one conductive polymer layer that is 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. This can increase the mechanical robustness of the part and improve its electrical performance.
대표청구항▼
1. A solid electrolytic capacitor comprising: an anode body that is the form of a pressed and sintered pellet;a dielectric overlying the anode body;a solid electrolyte overlying the dielectric, wherein the solid electrolyte contains a first conductive polymer layer that is adjacent to and in direct
1. A solid electrolytic capacitor comprising: an anode body that is the form of a pressed and sintered pellet;a dielectric overlying the anode body;a solid electrolyte overlying the dielectric, wherein the solid electrolyte contains a first conductive polymer layer that is adjacent to and in direct contact with the dielectric; andan external coating that overlies the solid electrolyte and contains a carbonaceous layer and a metal layer that overlies the carbonaceous layer, wherein the external coating further contains a second conductive polymer layer that is positioned between the carbonaceous layer and the metal layer, wherein the external coating comprises an additional carbonaceous layer that is positioned between the second conductive polymer layer and the metal layer. 2. The solid electrolytic capacitor of claim 1, wherein the first conductive polymer layer, the second conductive polymer layer, or both contain a polypyrrole, polythiophene, polyaniline, polyacetylene, poly-p-phenylene, polyphenolate, or a combination thereof. 3. The solid electrolytic capacitor of claim 2, wherein the first conductive polymer layer, the second conductive polymer layer, or both contain a polythiophene derivative having recurring units of general formula (I) or formula (II) or recurring units of general formulae (I) and (II): wherein, A is an optionally substituted C1 to C5 alkylene radical;R is a linear or branched, optionally substituted C1 to C18 alkyl radical; optionally substituted C5 to C12 cycloalkyl radical; optionally substituted C6 to C14 aryl radical; optionally substituted C7 to C18 aralkyl radical; optionally substituted C1 to C4 hydroxyalkyl radical, or hydroxyl radical; andx is an integer from 0 to 8. 4. The solid electrolytic capacitor of claim 3, wherein A is an optionally substituted C2 to C3 alkylene radical and x is 0 or 1. 5. The solid electrolytic capacitor of claim 3, wherein the polythiophene derivative is poly(3,4-ethylenedioxythiophene). 6. The solid electrolytic capacitor of claim 1, wherein the solid electrolyte further contains a third conductive polymer layer, wherein the first conductive polymer layer overlies the dielectric and the third conductive polymer layer overlies the first conductive polymer layer. 7. The solid electrolytic capacitor of claim 6, wherein the third conductive polymer layer is formed from a dispersion of conductive polymer particles. 8. The solid electrolytic capacitor of claim 7, wherein the first conductive polymer layer is formed from polymerization of a monomeric precursor and oxidizing agent. 9. The solid electrolytic capacitor of claim 8, wherein the first conductive polymer layer, the second conductive polymer layer, and the third conductive polymer layer contain polythiophene or a derivative thereof. 10. The solid electrolytic capacitor of claim 9, wherein the polythiophene derivative is poly(3,4-ethylenedioxythiophene). 11. The solid electrolytic capacitor of claim 8, wherein the carbonaceous layer contains graphite and the metal layer contains silver. 12. The solid electrolytic capacitor of claim 8, wherein the second conductive polymer layer is formed from polymerization of a monomeric precursor and oxidizing agent. 13. The solid electrolytic capacitor of claim 1, wherein the carbonaceous layer contains graphite. 14. The solid electrolytic capacitor of claim 1, wherein the metal layer contains silver. 15. The solid electrolytic capacitor of claim 1, wherein the second conductive polymer layer is formed from polymerization of a monomeric precursor and oxidizing agent. 16. The solid electrolytic capacitor of claim 1, wherein the second conductive polymer layer is formed from a dispersion of conductive polymer particles. 17. The solid electrolytic capacitor of claim 16, wherein the particles have an average diameter of from about 1 to about 500 nanometers. 18. The solid electrolytic capacitor of claim 16, wherein the particles have an average diameter of from about 10 to about 300 nanometers. 19. The solid electrolytic capacitor of claim 16, wherein the dispersion contains a polymeric anion. 20. The solid electrolytic capacitor of claim 16, wherein the polymeric anion is polystyrene sulfonic acid. 21. The solid electrolytic capacitor of claim 1, wherein the second conductive polymer layer has a thickness of from about 0.2 μm to about 20 μm. 22. The solid electrolytic capacitor of claim 1, wherein the external coating has a total thickness of from about 5 μm to about 300 μm. 23. The solid electrolytic capacitor of claim 1, wherein the anode body includes tantalum, niobium, or an electrically conductive oxide thereof. 24. The solid electrolytic capacitor of claim 23, wherein the anode body includes tantalum and the dielectric include tantalum pentoxide. 25. The solid electrolytic capacitor of claim 23, wherein the anode body includes niobium oxide and the dielectric include niobium pentoxide.
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이 특허에 인용된 특허 (44)
Reuter, Knud; Nikanorov, Valery A.; Bazhenov, Vassily M., Alkylenedioxythiophene dimers and trimers.
Maeda Takahiro,JPX ; Yanagi Shouichi,JPX ; Kuriyama Chojiro,JPX, Capacitor element for solid electrolytic capacitor, device and process for making the same.
Jonas Friedrich (Aachen DEX) Heywang Gerhard (Bergisch Gladbach DEX) Schmidtberg Werner (Leverkusen DEX) Heinze Jrgen (Freiburg DEX) Dietrich Michael (Freiburg DEX), Polythiophenes, process for their preparation and their use.
Jonas Friedrich (Aachen DEX) Heywang Gerhard (Bergisch-Gladbach DEX) Schmidtberg Werner (Leverkusen DEX), Solid electrolytes, and electrolyte capacitors containing same.
Kudoh Yasuo,JPX ; Akami Kenji,JPX ; Kojima Toshikuni,JPX ; Matsuya Yasue,JPX ; Shimada Hiroshi,JPX ; Hayashi Chiharu,JPX, Solid electrolytic capacitors comprising a conductive layer made of a polymer of pyrrole or its derivative.
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