Low leakage electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-2019096589-A1
Application number	US-201816203996-A
Country	US
Kind code	A1
Filing date	Nov 29, 2018
Priority date	Dec 12, 2016
Publication date	Mar 28, 2019
Grant date	—

Abstract

A low leakage electrolytic capacitor includes a winding-type capacitor element, a hybrid electrically conductive medium and a package body. The winding-type capacitor element includes an anode foil, a cathode foil, and a separator interposed between the anode foil and the cathode foil. The hybrid electrically conductive medium is impregnated in the winding-type capacitor element and includes an electrically conductive polymer, an auxiliary polymer, an ion liquid, and a carbon filler. The package body encloses the winding-type capacitor element and the hybrid electrically conductive medium.

First claim

What is claimed is:

1 . A low leakage electrolytic capacitor, comprising:
a winding-type capacitor element including an anode foil, a cathode foil, and a separator interposed between the anode foil and the cathode foil; a hybrid electrically conductive medium impregnated in the winding-type capacitor element and including an electrically conductive polymer, an auxiliary polymer, an ion liquid, and a carbon filler, wherein the auxiliary polymer includes at least one monomer selected from the group consisting of formulas (I)-(IV):

wherein R1 and R2 each independently represent a hydrogen, methyl, ethyl, propyl, butyl, hydroxyl, methyl epoxy, or methacrylate group, and n is an integer between 2 and 10; and
a package body enclosing the winding-type capacitor element and the hybrid electrically conductive medium.

2 . The low leakage electrolytic capacitor of claim 1 , wherein an amount of the auxiliary polymer is 0.1 to 5 wt % of a total weight of the hybrid electrically conductive medium.

3 . The low leakage electrolytic capacitor of claim 1 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), polythiophene (PT), polyacetylene (PA), polyaniline (PANI), or polypyrrole (PPy).

4 . The low leakage electrolytic capacitor of claim 3 , wherein an amount of the electrically conductive polymer is 1 to 20 wt % of a total weight of the hybrid electrically conductive medium.

5 . The low leakage electrolytic capacitor of claim 1 , wherein the ion liquid includes at least one cationic species selected from the group consisting of formulas (1)-(9) and at least one anionic species selected from the group consisting of formulae (10)-(17):

wherein R1 to R8 each independently represent a hydrogen atom, substituted or unsubstituted C1-C10 alkyl group, unsubstituted or substituted C1-C10 alkenyl group, unsubstituted or substituted C1-C10 alkynyl group, substituted or unsubstituted aryl group, substituted or unsubstituted heteroaryl group, acyl group, ester group, ether group, or amino group.

6 . The low leakage electrolytic capacitor of claim 5 , wherein an amount of the ion liquid is 0.05 to 30 wt % of a total weight of the hybrid electrically conductive medium.

7 . The low leakage electrolytic capacitor of claim 1 , wherein the carbon filler includes carbon nanotubes and graphene.

8 . The low leakage electrolytic capacitor of claim 7 , wherein an amount of the carbon filler is 0 to 5 wt % of a total weight of the hybrid electrically conductive medium.

9 . The low leakage electrolytic capacitor of claim 1 , wherein the hybrid electrically conductive medium further includes a lower volatility solvent which includes one or a combination of polyalkylene glycol or a derivative thereof, polyethylene glycol or a derivative thereof, polypropylene glycol or a derivative thereof, polytetramethylene glycol or a derivative thereof, a copolymer of ethylene glycol and propylene glycol, a copolymer of ethylene glycol and butylene glycol, and a copolymer of polypropylene glycol and butylene glycol.

10 . The low leakage electrolytic capacitor of claim 9 , wherein an amount of the lower volatility solvent is about 0.05 to about 50 wt % of a total weight of the hybrid electrically conductive medium.

11 . The low leakage electrolytic capacitor of claim 1 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (I), the carbon filler includes carbon nanotubes and graphene, and in formula (I), R1 and R2 each independently represent a hydrogen group.

12 . The low leakage electrolytic capacitor of claim 1 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (II), the carbon filler includes carbon nanotubes and graphene, and in formula (II), R1 and R2 each independently represent a methyl epoxy group.

13 . The low leakage electrolytic capacitor of claim 1 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (III), the carbon filler includes carbon nanotubes and graphene, and in formula (III), R1 and R2 each independently represent a methyl group.

14 . The low leakage electrolytic capacitor of claim 1 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (IV), the carbon filler includes carbon nanotubes and graphene, and in formula (IV), R1 and R2 each independently represent a methacrylate group.

15 . The low leakage electrolytic capacitor of claim 5 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (I), the ion liquid includes a cationic specie of formula (1) and an anionic specie of formula (10), the carbon filler includes carbon nanotubes and graphene, and in formula (I), R1 and R2 each independently represent a hydrogen group.

16 . The low leakage electrolytic capacitor of claim 5 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (II), the ion liquid includes a cationic specie of formula (1) and an anionic specie of formula (12), the carbon filler includes carbon nanotubes and graphene, and in formula (II), R1 and R2 each independently represent a methyl epoxy group.

17 . The low leakage electrolytic capacitor of claim 5 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (III), the ion liquid includes a cationic specie of formula (2) and an anionic specie of formula (10), the carbon filler includes carbon nanotubes and graphene, and in formula (III), R1 and R2 each independently represent a methyl group.

18 . The low leakage electrolytic capacitor of claim 5 , wherein the electrically conductive polymer is polyethylene dioxythiophene doped with polystyrene sulfonic acid (PEDOT:PSS), the auxiliary polymer is formed of a monomer of formula (IV), the ion liquid includes a cationic specie of formula (2) and an anionic specie of formula (14), the carbon filler includes carbon nanotubes and graphene, and in formula (IV), R1 and R2 each independently represent a methacrylate group.

Assignees

• Apaq Technology Co Ltd

Inventors

• Chen Ming-Tsung
• Su Chung-Jui

Classifications

• H01G9/10

  Sealing, e.g. of lead-in wires · CPC title

• H01G9/151 Primary

  with wound foil electrodes · CPC title

• H01G9/028

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

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G9/145

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