Cathode Materials Containing Core Shell Nanoparticles

Patent metadata

Field	Value
Publication number	US-2016211081-A1
Application number	US-201614993374-A
Country	US
Kind code	A1
Filing date	Jan 12, 2016
Priority date	Jan 15, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

Provided herein is a capacitor, and method for forming a capacitor, comprising an anode, a dielectric over the anode; a cathode over the dielectric; and the cathode comprises core shell particles.

First claim

Claimed is:

1 . A capacitor comprising:
an anode; a dielectric over said anode; a cathode over said dielectric; and wherein said cathode comprises core shell particles.

2 . The capacitor of claim 1 wherein said cathode comprises a primary conductive layer with said core shell particles in said primary conductive layer.

3 . The capacitor of claim 2 wherein said primary conductive layer comprises a conductive polymer.

4 . The capacitor of claim 3 wherein said conductive polymer is selected from the group consisting of polyaniline, polypyrrole and polythiophene.

5 . The capacitor of claim 4 wherein said polythiophene is polymerized 3,4-polyethylene dioxythiophene.

6 . The capacitor of claim 1 wherein said cathode comprises a transition region comprising at least one of a first layer and a second layer with said core shell particles in said transition region.

7 . The capacitor of claim 6 wherein said first layer comprises conductive carbon.

8 . The capacitor of claim 7 wherein said first layer comprises said core shell particles.

9 . The capacitor of claim 6 wherein said second layer comprises a metal.

10 . The capacitor of claim 9 wherein said second layer comprises said core shell particles.

11 . The capacitor of claim 9 wherein said metal is in a coating.

12 . The capacitor of claim 9 wherein said metal is selected from the group consisting of silver, copper, nickel, indium, tin, palladium and gold.

13 . The capacitor of claim 1 wherein said core shell particles comprise a core and a a polymeric shell.

14 . The capacitor of claim 13 wherein said polymeric shell has at least one reactive group.

15 . The capacitor of claim 14 wherein said reactive group is selected from group consisting of epoxy, carboxylic, phenolic, hydroxyl, amino, amide, isocyanate, thiol, imide, mercapto, sulfone, urethane, cyanate, ester, acrylic, anhydride, urethane, nitro, silane and sulphonic acid.

16 . The capacitor of claim 13 further comprising a secondary core shell particle comprising a core selected from metal, graphene, organic, polymer, or an inorganic.

17 . The capacitor of claim 13 wherein said core comprises crosslinked rubbery molecules.

18 . The capacitor of claim 17 wherein said core comprises a material selected from the group consisting of polybutadiene, polyisoprene, styrene butadiene rubber, acrylic, siloxane, silicone, urethane.

19 . The capacitor of claim 1 wherein core shell particles have an average particle size of no more than 500 nm.

20 . The capacitor of claim 19 wherein core shell particles have an average particle size of no more than 150 nm.

21 . The capacitor of claim 19 wherein core shell particles have an average particle size of at least 50 nm.

22 . A conductive formulation comprising:
a conductor; primary core shell particles; and secondary core shell particles.

23 . The conductive formulation of claim 22 further comprising a thermoset monomer or polymer.

24 . The conductive formulation of claim 22 further comprises a thermoplastic polymer.

25 . The conductive formulation of claim 22 wherein said conductor is selected from the group consisting of a conductive polymer, a conductive carbon and a metal.

26 . The conductive formulation of claim 25 wherein said conductor is a dispersion of conducting polymer particles and said conductive formulation further comprises a polyanion.

27 . The conductive formulation of claim 26 wherein said conducting polymer particle are selected from the group consisting of polyaniline, polypyrrole and polythiophene.

28 . The conductive formulation of claim 27 wherein said polythiophene is polymerized 3,4-polyethylene dioxythiophene.

29 . The conductive formulation of claim 25 where said conductive carbon is selected from the group consisting of carbon black, graphite, graphene, carbon nanotube and fullererene.

30 . The conductive formulation of claim 25 where said metal is selected from the group consisting of silver, copper, nickel, indium, tin, palladium, gold, silver coated metal particle, tin coated metal particles, palladium coated metal particle, gold coated metal particle, their alloys, blends, and their mixtures.

31 . The conductive formulation of claim 22 wherein said secondary core shell particles comprise a core selected from metal, graphene, organic, polymer, or an inorganic.

32 . A method of forming a capacitor comprising the steps of:
forming a dielectric on an anode; forming a cathode layer on said dielectric wherein said cathode comprises core shell particles and a resin; and treating said cathode layer to crosslink said core shell particles with said resin.

33 . The method of forming a capacitor of claim 32 wherein said resin is selected from thermoplastic resin or thermoset resin.

34 . The method of forming a capacitor of claim 32 wherein said resin is selected from a polyester, epoxy, phenolic, polyacrylic, polyvinyl butyral, phenoxy, polyimide, bismaleimide, polysiloxane, phenol-formaldehyde, urea-formaldehyde, melaimine, polycynurate, polystyrene sulfonic acid, polyester sulfonate, poly phenol sulfonates, polyurethane, fluropolyemrs, silicone, phenolics, vinyl ester, polysulfone, their blends and copolymers.

35 . The method of forming a capacitor of claim 32 wherein said forming of said cathode comprises forming a primary conductive layer with said core shell particles in said primary conductive layer.

36 . The method of forming a capacitor of claim 35 wherein said primary conductive layer comprises a conductive polymer.

37 . The method of forming a capacitor of claim 36 wherein said conductive polymer is selected from the group consisting of polyaniline, polypyrrole and polythiophene.

38 . The method of forming a capacitor of claim 37 wherein said polythiophene is polymerized 3,4-polyethylene dioxythiophene.

39 . The method of forming a capacitor of claim 32 wherein said forming of said cathode comprises forming a transition region comprising at least one of a first layer and a second layer with said core shell particle in said transition region.

40 . The method of forming a capacitor of claim 39 wherein said first layer comprises conductive carbon.

41 . The method of forming a capacitor of claim 40 wherein said first layer comprises said core shell particles.

42 . The method of forming a capacitor of claim 39 wherein said second layer comprises a metal.

43 . The method of forming a capacitor of claim 42 wherein said second layer comprises said core shell particles.

44 . The method of forming a capacitor of claim 42 wherein said metal is in a coating.

45 . The method of forming a capacitor of claim 42 wherein said metal is selected from the group consisting of silver, copper, nickel, indium, tin, palladium and gold.

46 . The method of forming a capacitor of claim 32 wherein said core shell particles comprise a core and a polymeric shell

47 . The method of forming a capacitor of

Assignees

• Kemet Electronics Corp

Inventors

• Chacko Antony P
• Ols John Joseph

Classifications

• H01G9/0425 Primary

  specially adapted for cathode · CPC title

• H01G9/15

  Solid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G9/028

  Organic semiconducting electrolytes, e.g. TCNQ · CPC title

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• C25D11/26

  of refractory metals or alloys based thereon · CPC title