Slurry composition for secondary-battery negative electrode, secondary-battery negative electrode, and secondary battery

Patent metadata

Field	Value
Publication number	US-2016118664-A1
Application number	US-201414890672-A
Country	US
Kind code	A1
Filing date	May 23, 2014
Priority date	May 23, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

The disclosed slurry composition for a secondary-battery negative electrode includes a water-soluble thickener (A) having a hydroxy group or a carboxyl group, a cross-linking agent (B) having a functional group reactive with the hydroxy group or the carboxyl group, a particulate polymer (C) having a functional group reactive with the cross-linking agent (B), a negative electrode active material containing a non-carbon-based negative electrode active material, and water. The slurry composition contains 0.5 to 20 mass parts of the water-soluble thickener (A), 0.001 to 10 mass parts of the cross-linking agent (B), and 0.5 to 20 mass parts of the particulate polymer (C), per 100 mass parts of the negative electrode active material.

First claim

1 . A slurry composition for a secondary-battery negative electrode, comprising a water-soluble thickener (A) having a hydroxy group or a carboxyl group, a cross-linking agent (B) having a functional group reactive with the hydroxy group or the carboxyl group of the water-soluble thickener (A), a particulate polymer (C), a negative electrode active material, and water, wherein
the negative electrode active material contains a non-carbon-based negative electrode active material, the particulate polymer (C) has a functional group reactive with the cross-linking agent (B), and the slurry composition for a secondary-battery negative electrode contains 0.5 mass parts or more but 20 mass parts or less of the water-soluble thickener (A), 0.001 mass parts or more but 10 mass parts or less of the cross-linking agent (B), and 0.5 mass parts or more but 20 mass parts or less of the particulate polymer (C), per 100 mass parts of the negative electrode active material.

2 . The slurry composition for a secondary-battery negative electrode according to claim 1 , wherein the water-soluble thickener (A) is at least one selected from the group consisting of carboxymethyl cellulose, methyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl methylcellulose, polyvinyl alcohol, polycarboxilic acid, and salts thereof.

3 . The slurry composition for a secondary-battery negative electrode according to claim 1 , wherein the cross-linking agent (B) is at least one compound selected from the group consisting of a multifunctional epoxy compound, an oxazoline compound, and a carbodiimide compound.

4 . The slurry composition for a secondary-battery negative electrode according to claim 1 , wherein the particulate polymer (C) contains an aliphatic conjugated diene monomer unit and an aromatic vinyl monomer unit.

5 . The slurry composition for a secondary-battery negative electrode according to claim 1 , wherein the functional group reactive with the cross-linking agent (B) in the particulate polymer (C) is at least one group selected from the group consisting of a carboxyl group, a hydroxy group, a glycidyl ether group, and a thiol group.

6 . A secondary-battery negative electrode, having a negative-electrode mixed material layer obtained from the slurry composition for a secondary-battery negative electrode according to claim 1 .

7 . The secondary-battery negative electrode according to claim 6 , wherein the negative-electrode mixed material layer has a cross-linked structure formed from the water-soluble thickener (A), the cross-linking agent (B), and the particulate polymer (C).

8 . A secondary battery comprising the secondary-battery negative electrode according to claim 6 , a positive electrode, an electrolysis solution, and a separator.

Assignees

• Zeon Corp

Inventors

• Sonobe Kenya

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title