Capacitor with charge time reducing additives and work function modifiers

Patent metadata

Field	Value
Publication number	US-9793058-B2
Application number	US-201514717414-A
Country	US
Kind code	B2
Filing date	May 20, 2015
Priority date	May 21, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A capacitor, and method for making the capacitor, is provided with improved charging characteristics. The capacitor has an anode, a cathode comprising a conductive polymer layer and a work function modifier layer adjacent the conductive polymer layer and a dielectric layer between the anode and the cathode.

First claim

The invention claimed is:

1. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer; and
a work function modifier layer adjacent said conductive polymer layer wherein said work function modifier layer is between said conductive polymer layer and an adjacent conductive polymer layer; and

a dielectric layer between said anode and said cathode.

2. The capacitor of claim 1 further comprising a second work function modifier layer between said dielectric layer and said conductive polymer layer.

3. The capacitor of claim 1 wherein said capacitor has a CV of at least 400 μFV.

4. The capacitor of claim 1 with a charge time which is no more than 1.5times a theoretical charge time.

5. The capacitor of claim 1 with a charge time which is no more than 1.2times said theoretical charge time.

6. The capacitor of claim 1 wherein said charge time is no more than 1 times said theoretical charge time.

7. The capacitor of claim 1 wherein said conductive polymer layer comprises a polyanion.

8. The capacitor of claim 7 wherein said polyanion is polystyrene sulfonic acid.

9. The capacitor of claim 1 wherein said work function modifier layer comprises a work function modifier capable of reducing a work function of said conductive polymer layer.

10. The capacitor of claim 9 wherein said work function modifier reduces said work function by at least 0.1 eV to no more than 1 eV.

11. The capacitor of claim 9 wherein said work function modifier reduces said work function to no more than 0.5 eV.

12. The capacitor of claim 9 wherein said work function modifier is an inorganic oxides.

13. The capacitor of claim 12 wherein said inorganic oxide is selected from zinc oxides, cerium oxides, indium oxides and manganese oxides.

14. The capacitor of claim 9 wherein said work function modifier is an organometallic compound.

15. The capacitor of claim 9 wherein said work function modifier is an ionic liquid.

16. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer; and
a work function modifier layer adjacent said conductive polymer layer; and

a dielectric layer between said anode and said cathode;
wherein said work function modifier layer comprises a work function modifier capable of reducing a work function of said conductive polymer layer; and
wherein said work function modifier has a particle size of at least 10 nm to no more than 100 nm.

17. The capacitor of claim 16 wherein said work function modifier has a particle size of at least 20 nm to no more than 40 nm.

18. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer;
a work function modifier layer adjacent said conductive polymer layer; and

a dielectric layer between said anode and said cathode;
wherein said work function modifier layer comprises a work function modifier capable of reducing a work function of said conductive polymer layer; and
wherein said work function modifier is an organometallic compound and the organometallic compound is an organotitanate.

19. The capacitor of claim 18 wherein said organotitanates is selected from the group consisting of di-alkoxy acyl titanate, tri-alkoxy acyl titanate, alkoxy triacyl titantate, alkoxy titantate, neoalkoxy titanate, titanium IV 2,2(bis 2-propenolatomethyl) butanolato, tris neodecanoato-O; titanium IV 2,2(bis 2-propenolatomethyl) butanolato, iris(dodecyl)benzenesulfonato-O; titanium IV 2,2(bis 2-propenolatomethyl) butanolato, tris(dioctyl)phosphato-O; titanium IV 2,2(bis 2-propenolatomethyl) tris(dioctyl)pyrophosphatobutanolato-O; titanium IV 2,2(bis 2-propenolatomethyl) butanolato, tris(2-ethylenediamino)ethylato; and titanium IV 2,2(bis 2-propenolatomethyl) butanolato, tris(3-amino)phenylato being representative neoalkoxy titanates and derivatives thereof.

20. The capacitor of claim 19 wherein said alkoxy titanate is a neoalkoxy titanate.

21. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer; and
a work function modifier layer adjacent said conductive polymer layer; and

a dielectric layer between said anode and said cathode wherein said work function modifier layer comprises a work function modifier capable of reducing a work function of said conductive polymer layer; and
where said work function modifier is an organic compound with reactive functional groups.

22. The capacitor of claim 21 wherein at least one functional group of said functional groups is epoxy.

23. The capacitor of claim 21 wherein said work function modifier is selected from the group consisting of cycloaliphatic epoxy resin, ethylene glycol diglycidyl ether, bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, novolac epoxy resin, aliphatic epoxy resin, Glycidylamine epoxy resin, ethylene glycol diglycidyl ether (EGDGE), propylene glycol diglycidyl ether (PGDGE), 1,4-butanediol diglycidyl ether (BDDGE), pentylene glycol diglycidyl ether, hexylene glycol diglycidyl ether, cyclohexane dimethanol diglycidyl ether, resorcinol glycidyl ether, glycerol diglycidyl ether (GDGE), glycerol polyglycidyl ethers, diglycerol polyglycidyl ethers, trimethylolpropane polyglycidyl ethers, sorbitol diglycidyl ether (Sorbitol-DGE), sorbitol polyglycidyl ethers, polyethylene glycol diglycidyl ether (PEGDGE), polypropylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, di(2,3-epoxypropyl)ether, 1,3-butadiene diepoxide, 1,5-hexadiene diepoxide, 1,2,7,8-diepoxyoctane, 1,2,5,6-diepoxycyclooctane, 4-vinyl cyclohexene diepoxide, bisphenol A diglycidyl ether, maleimide-epoxy compounds, and derivatives thereof.

24. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer; and
a work function modifier layer adjacent said conductive polymer layer; and

a dielectric layer between said anode and said cathode wherein said work function modifier layer comprises a work function modifier capable of reducing a work function of said conductive polymer layer; and
wherein said work function modifier is a polycationic compound.

25. The capacitor of claim 24 wherein said work function modifier is selected from the group consisting of amidinium, phosphonium, quaternary ammonium, guanadinium, anilinium, thiouronium, carbenium, pyridinium, imidazolium, sulfonium, diazonium and derivatives thereof.

26. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer; and
a work function modifier layer adjacent said conductive polymer layer; and

a dielectric layer between said anode and said cathode wherein said work function modifier layer comprises a work function modifier capable of reducing a work function of said conductive polymer layer and wherein said work function modifier is an ionic liquid from the group consisting of:

1-ethyl-3-methylimidazolium tetrafluoroborate and derivatives thereof.

27. The capacitor of claim 15 wherein said ionic liquid is selected from cationic ionic liquids or polycationic ionic liquids.

28. A capacitor comprising:
an anode;
a cathode comprising:
a conductive polymer layer; and
a work function modifier layer adjacent said conductive polymer

Assignees

• Kemet Electronics Corp

Inventors

• Chacko Antony P
• Shi Yaru
• Ramsbottom Robert
• Kinard John T
• Ols John Joseph

Classifications

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• H01G9/048

  characterised by their structure (H01G11/22 takes precedence) · CPC title

• H01G9/025 Primary

  Solid electrolytes (H01G11/54 takes precedence) · CPC title

• H01G9/0032

  formation of the dielectric layer · CPC title

• Y10T29/42

  Piezoelectric device making · CPC title