Granted Patent B2

US 12,362,363 · App. 17/777,509 · Granted Jul 15, 2025

Inventors: Yuta Kawahara (Tatsuno, JP); Tomonori Kurata (Kawasaki, JP); Mitsuru Hanasaki (Himeji, JP)

Assignee: Resonac Corporation

H01M4/622C08F220/06C08L33/02H01M4/0404H01M4/139H01M10/0569H01M4/13H01M2300/0034H01M2300/004

Abstract

Claims (25)

1. An electrode binder for a nonaqueous secondary battery, which is water-soluble and comprises a resin component and a surfactant,

wherein a surface free energy YB at 23° C. is 70 mJ/m 2 or less;

a dipole component γ P B of the surface free energy is 26 mJ/m 2 or less;

the surfactant is polyoxyethylene alkyl ether;

the resin component comprises

a polymer of a compound having an ethylenically unsaturated bond, and

a dispersant selected from the group consisting of carboxymethyl cellulose and its metal salts;

the polymer is a copolymer of compounds comprising

a compound having an ethylenically unsaturated bond selected from the group consisting of (meth)acrylic acid and (meth)acrylic acid salt, and

another vinyl compound selected from the group consisting of styrene, a divinylbenzene, a butadiene, an N-vinylacetamide, an N-vinylformamide, a vinyl alcohol, a vinyl acetate.

2. The electrode binder for a nonaqueous secondary battery according to claim 1 , wherein the surface free energy γ B is 66 mJ/m 2 or less.

3. The electrode binder for a nonaqueous secondary battery according to claim 1 , wherein the dipole component γ P B of the surface free energy is 22 mJ/m 2 or less.

4. The electrode binder for a nonaqueous secondary battery according to claim 1 , wherein a hydrogen bonding component γ h B of the surface free energy is 24 mJ/m 2 or less.

5. A nonaqueous secondary battery electrode, comprising a current collector and an electrode active material layer,

wherein the electrode active material layer comprises an electrode binder for a nonaqueous secondary battery according to claim 1 , and an electrode active material; and

the electrode active material layer is formed on the current collector.

6. The nonaqueous secondary battery electrode according to claim 5 ,

wherein the electrode active material layer comprises 85% by mass or more and 99% by mass or less of the electrode active material.

7. The nonaqueous secondary battery electrode according to claim 5 , wherein the electrode active material comprises a Si element-containing material and a carbon material.

8. The nonaqueous secondary battery electrode according to claim 5 , wherein a peeling strength of the electrode active material layer with respect to the current collector is 30 mN/mm or more.

9. A nonaqueous secondary battery, which comprises the nonaqueous secondary battery electrode according to claim 5 ,

wherein the nonaqueous secondary battery uses an alkali metal ion as a charge carrier.

10. The nonaqueous secondary battery according to claim 9 , comprising

an organic solvent solution of an alkali metal salt, as an electrolyte solution.

11. The nonaqueous secondary battery according to claim 10 , wherein the organic solvent of the electrolyte solution comprises at least one kind selected from the group consisting of a carbonate compound, a nitrile compound and a carboxylic acid ester.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (23)