Tantalum capacitor
A tantalum capacitor includes a tantalum body comprising a tantalum sintered body containing tantalum powder, a conductive polymer layer disposed on the tantalum sintered body and including a first filler as a non-conductive particle, and a tantalum wire. The first filler includes a core including at least one metal oxide among BaTiO 3 , Al 2 O 3 , SiO 2 and ZrO 2 , and a coating film disposed on a surface of the core.
1. A tantalum capacitor comprising:
a tantalum body comprising
a tantalum sintered body containing tantalum particle,
a conductive polymer layer disposed on the tantalum sintered body and including a first filler as a non-conductive particle, and
a tantalum wire,
wherein the first filler includes a core including at least one metal oxide among BaTiO 3 , Al 2 O 3 , SiO 2 and ZrO 2 , and a coating film disposed on a surface of the core.
2. The tantalum capacitor of claim 1 , wherein the coating film comprises poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
3. The tantalum capacitor of claim 2 , wherein the core of the first filler is SiO 2 .
4. The tantalum capacitor of claim 2 , wherein the coating film is coupled to the core by a coupling agent.
5. The tantalum capacitor of claim 4 , wherein the coupling agent is covalently bonded to the surface of the core and is bonded to the PSS in the coating film.
6. The tantalum capacitor of claim 5 , wherein the PEDOT in the coating film is ionically bonded to the PSS in the coating film.
7. The tantalum capacitor of claim 6 , wherein the conductive polymer layer comprises poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
8. The tantalum capacitor of claim 7 , wherein the conductive polymer layer further comprises a second filler as conductive particles.
9. The tantalum capacitor of claim 8 , wherein the second filler comprises at least one of graphene, carbon nanotubes, and carbon black.
10. The tantalum capacitor of claim 9 , wherein the second filler comprises a metal oxide coating film coated on a surface of the second filler.
11. The tantalum capacitor of claim 10 , wherein the tantalum body further comprises:
a carbon layer disposed on the conductive polymer layer; and
a silver (Ag) layer disposed on the carbon layer, and
the tantalum wire penetrates through at least a portion of each of the tantalum sintered body, the conductive polymer layer, the carbon layer, and the silver (Ag) layer.
12. The tantalum capacitor of claim 11 , wherein the tantalum capacitor includes,
a molded portion including a fifth surface and a sixth surface opposing in a first direction, a third surface and a fourth surface opposing in a second direction, and a first surface and a second surface opposing in a third direction, the molded portion surrounding the tantalum body,
an anode lead frame extending from the second surface of the molded portion and electrically connected to the tantalum wire; and
a cathode lead frame spaced apart from the anode lead frame and extending from the second surface of the molded portion.
13. A tantalum capacitor comprising:
a tantalum body comprising
a tantalum sintered body containing tantalum particle,
a conductive polymer layer disposed on the tantalum sintered body and including a first filler, and
a tantalum wire,
wherein the first filler includes a core and a coating film disposed on a surface of the core, and
the coating film includes poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
14. The tantalum capacitor of claim 13 , wherein the core of the first filler comprises an oxide including at least one of Ba, Ti, Al, Si and Zr.
15. The tantalum capacitor of claim 13 , wherein a cross-sectional area ratio of the first filler with respect to one cross-section of the conductive polymer layer is greater than 0.41 and less than 0.81.
16. A tantalum capacitor comprising:
a tantalum body comprising
a tantalum sintered body containing a tantalum particle, and
a conductive polymer layer disposed on the tantalum sintered body and including a first filler having a core-shell structure including a core including a metal oxide.
17. The tantalum capacitor of claim 16 , wherein the metal oxide includes at least one of Ba, Ti, Al, Si and Zr.
18. The tantalum capacitor of claim 16 , wherein the shell includes a first conductive polymer.
19. The tantalum capacitor of claim 18 , wherein the first conductive polymer includes poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
20. The tantalum capacitor of claim 18 , wherein the conductive polymer layer further includes a second conductive polymer.
21. The tantalum capacitor of claim 20 , wherein the first and second conductive polymers include the same material.
22. The tantalum capacitor of claim 16 , wherein a cross-sectional area ratio of the first filler with respect to one cross-section of the conductive polymer layer is greater than 0.41.
23. The tantalum capacitor of claim 16 , wherein a cross-sectional area ratio of the first filler with respect to one cross-section of the conductive polymer layer is greater than 0.41 and less than 0.81.
24. The tantalum capacitor of claim 16 , wherein the tantalum body further comprises a tantalum wire.