BINDER RESIN EMULSION FOR ENERGY DEVICE ELECTRODE AND ENERGY DEVICE ELECTRODE AND ENERGY DEVICE THAT USE SAME

• US 20070287064A1
• Filed: 08/10/2007
• Published: 12/13/2007
• Est. Priority Date: 02/10/2005
• Status: Abandoned Application

• Current Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Original Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Inventors: Suzuki, Kenji, Mashita, Kiyotaka
• Application Number:
  US11/836,954
• Publication Number:
  US 20070287064A1
• Time in Patent Office: Days
• US Class Current: 429/217
• CPC Class Codes: H01G 11/38 Carbon pastes or blends; Binders or additives therein
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A binder resin emulsion for energy device electrodes is provided that is used in energy device electrodes and more particularly that is used as a binder to dispose an active material on the current collector of such an electrode. An energy device electrode and energy device that use this emulsion are also provided. A binder resin emulsion for energy device electrodes is used that comprises: a copolymer of an α,β-unsaturated carboxylic acid and an α-olefin that has been neutralized with a neutralizing agent; and water. Also, an energy device electrode and an energy device that use this binder resin emulsion are utilized.

Claims

1. A binder resin emulsion for an energy device electrode, comprising:

a copolymer of an α

,β

-unsaturated carboxylic acid and an α

-olefin that has been neutralized with a neutralizing agent; and

water.

2. The binder resin emulsion for an energy device electrode according to claim 1, wherein the copolymer is an ethylene-(meth)acrylic acid copolymer, and the neutralizing agent is an amine compound.

3. The binder resin emulsion for an energy device electrode according to claim 2, wherein the copolymer has an MFR of 30 to 100 g/10 min, and the ethylene unit/(meth)acrylic acid unit mass ratio is 85/15 to 75/25.

4. The binder resin emulsion for an energy device electrode according to claim 2, wherein the neutralizing agent is an alkanolamine.

5. The binder resin emulsion for an energy device electrode according to claim 1, wherein 20 to 100 mol % of the carboxyl groups in the copolymer are neutralized.

6. The binder resin emulsion for an energy device electrode according to claim 1, wherein said α

-olefin is a compound with the following formula (I);

CH₂═

CH—

R 

 

(I)

wherein R is selected from the hydrogen atom, C_1-12 alkyl groups which may be branched or unbranched and saturated or unsaturated, C_3-10 alicyclic alkyl groups which may be saturated or unsaturated, and C_6-12 aryl groups.

7. The binder resin emulsion for an energy device electrode according to claim 1, wherein said α

-olefin is selected from the group consisting of ethylene, propylene and butylene.

8. The binder resin emulsion for an energy device electrode according to claim 1, wherein said α

-olefin is ethylene.

9. The binder resin emulsion for an energy device electrode according to claim 1, wherein said α

,β

-unsaturated carboxylic acid is a compound with the following formula (II);

wherein R₁ and R₂ may be the same as each other or may differ from one another and are selected from the hydrogen atom, carboxyl group, acetyl group, C_1-12 alkyl groups which may be branched or unbranched and saturated or unsaturated, C_3-10 alicyclic alkyl groups which may be saturated or unsaturated, and C_6-12 aryl groups.

10. The binder resin emulsion for an energy device electrode according to claim 1, wherein said α

,β

-unsaturated carboxylic acid is selected from the group consisting of (Meth)acrylic acid, ethacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid and fumaric acid.

11. The binder resin emulsion for an energy device electrode according to claim 1, wherein said α

,β

-unsaturated carboxylic acid is (Meth)acrylic acid.

12. The binder resin emulsion for an energy device electrode according to claim 1, wherein said neutralizing agent is an amine compound.

13. The binder resin emulsion for an energy device electrode according to claim 1, wherein said copolymer is an ethylene-(meth)acrylic acid copolymer.

14. An energy device electrode having a current collector and a composite layer disposed on at least one side of the current collector, wherein said composite layer is obtained by the steps of:

(a) applying onto the current collector a slurry comprising an active material and the binder resin emulsion for an energy device electrode according to claim 1;

and

(b) removing a solvent from the applied slurry.

15. The energy device electrode according to claim 14, wherein said current collector is copper.

16. The energy device electrode according to claim 14, wherein said active material is a carbon.

17. An energy device electrode having a current collector and a composite layer disposed on at least one side of the current collector, wherein said composite layer is obtained by the steps of:

(a) applying onto the current collector a slurry comprising an active material and the binder resin emulsion for an energy device electrode according to claim 2;

and

(b) removing a solvent from the applied slurry.

18. The energy device electrode according to claim 14, wherein said solvent is water.

19. An energy device comprising the energy device electrode according to claim 14.

20. The energy device according to claim 15, wherein the energy device is a lithium battery or a capacitor.