Electrical energy storage device having a porous organic electrode

• US 5,748,438 A
• Filed: 12/08/1994
• Issued: 05/05/1998
• Est. Priority Date: 10/04/1993
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Davis, James L., Williams, Melanie, Pennisi, Robert W.
• Primary Examiner(s): Ledynh, Bot L.
• Application Number:
  US08/351,983
• Time in Patent Office: 1,244 Days
• Field of Search: 361/502-504, 361/508, 361/516-517, 361/523, 361/525, 361/528, 361/532, 429/12, 429/27-29, 429/40-42, 429/46, 429/128, 429/188, 429/208, 429/209, 429/218, 252/62.2
• US Class Current: 361/504
• CPC Class Codes: H01G 9/042 characterised by the material H01G11/22 takes precedence
• CPC Class Codes: H01G 9/048 characterised by their structure H01G11/22 takes precedence
• CPC Class Codes: H01M 4/137 Electrodes based on electro-active polymers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

An ultracapacitor having two porous organic membrane electrodes is made from microporous polymer substrates (10). The surface of the polymer substrate and the walls of the micropores (30) are coated with metal oxides. Both sides of the substrate can be coated with the conductive materials. The film can be a carboxylic ion-exchange material dispersed in a microporous copolymer matrix, and the film can be supported on a woven nylon substrate. The two electrodes (82, 84) are situated substantially parallel to each other, with the coated surface of one electrode facing the coated surface of the other electrode. An ionic electrolyte solution (89) fills the gap (86) between the electrodes.

Claims

1. An electrical energy storage device, comprising:

two electrodes, each comprising a film of a carboxylic ion-exchange material dispersed in a microporous copolymer matrix, the film supported on a woven nylon substrate; and

a thin coating of one or more materials selected from the group consisting of aluminum, titanium, copper, tungsten, tantalum, nickel, rhodium, rhenium, and oxides or carbides thereof deposited in the microporous copolymer matrix;

said electrodes situated substantially parallel to each other, forming a gap between the electrodes; and

an electrolyte disposed in the gap between the electrodes.

2. The electrical energy as described in claim 1, wherein the electrodes and the electrolyte is situated within a housing.

3. An ultracapacitor having microporous electrodes, comprising:

first and second electrode films each comprising a porous polystyrene divinylbenzene membrane;

the electrode films coated with a thin layer of metal oxide;

the electrode films situated substantially parallel to each other and forming a gap between them, a first major surface of the first electrode film facing a first major surface of the second electrode film; and

an ionic electrolyte solution disposed in the gap between the electrode films.

4. The ultracapacitor as described in claim 3, further comprising an electrode separator disposed between the electrode films.

5. The ultracapacitor as described in claim 3, wherein the ionic electrolyte solution is a dilute solution of H₂ SO₄, HCl, or NaOH.

6. The ultracapacitor as described in claim 3, wherein a second major surface of the electrode film is coated with a thin film of aluminum, titanium, copper, tungsten, or nickel.

7. The ultracapacitor as described in claim 3, wherein the metal oxide is one or more oxides selected from the group consisting of tantalum oxides, tungsten oxides, and titanium oxides.

8. An electrical energy storage device having a porous organic membrane electrode, comprising:

first and second electrodes, each comprising a microporous polymer substrate having first and second major surfaces and having a matrix of microporous openings, the first major surface and the walls of the microporous openings coated with a metal oxide;

said electrodes situated substantially parallel to each other and forming a gap between the electrodes, the first major surface of the first electrode facing the first major surface of the second electrode; and

an ionic electrolyte solution disposed in the gap between the electrodes.

9. The electrical energy storage device as described in claim 8, further comprising an electrode separator situated between the electrodes and disposed in the electrolyte.

10. The electrical energy storage device as described in claim 8, wherein the electrolyte is a dilute solution of H₂ SO₄, HCl, or NaOH.

11. The electrical energy storage device as described in claim 8, wherein the microporous polymer is polystyrene divinylbenzene.