Slurry composition for lithium ion secondary battery negative electrode, negative electrode for lithium ion secondary battery and method for producing the same, and lithium ion secondary battery

• US 10,297,819 B2
• Filed: 11/08/2013
• Issued: 05/21/2019
• Est. Priority Date: 11/09/2012
• Status: Active Grant

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: Sasaki, Tomokazu
• Primary Examiner(s): Essex, Stephan J
• Application Number:
  US14/440,583
• Publication Number:
  US 20150303463A1
• Time in Patent Office: 2,020 Days
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/1393 of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/1395 of electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/583 Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A slurry composition for a lithium ion secondary battery negative electrode including a negative electrode active material, a conductive material, a water-soluble polymer, and a particulate binder, wherein an amount of the conductive material with respect to 100 parts by weight of the negative electrode active material is 0.1 parts by weight to 10 parts by weight, the water-soluble polymer has a 1% aqueous solution viscosity of 10 mPa·s to 3,000 mPa·s, and the particulate binder contains a particulate binder A having a surface acid amount of 0.01 meq/g or more and 0.10 meq/g or less and a particulate binder B having a surface acid amount of 0.15 meq/g or more and 0.5 meq/g or less.

Claims

1. A slurry composition for a lithium ion secondary battery negative electrode, the slurry composition comprising a negative electrode active material, a conductive material, a water-soluble polymer, and a particulate binder, wherein

an amount of the conductive material with respect to 100 parts by weight of the negative electrode active material is 0.1 parts by weight to 10 parts by weight,

the water-soluble polymer has a 1% aqueous solution viscosity of 10 mPa·

s to 3,000 mPa·

s, and

the particulate binder contains a particulate binder A having a surface acid amount of 0.01 meq/g or more and 0.10 meq/g or less and a particulate binder B having a surface acid amount of 0.15 meq/g or more and 0.5 meq/g or less.

2. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein the negative electrode active material is at least one selected from the group consisting of graphite and silicon-containing compounds.

3. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein the conductive material has a specific surface area of 50 m²/g to 1,500 m²/g.

4. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein the water-soluble polymer contains carboxymethyl cellulose.

5. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein the particulate binder A contains 0.1% by weight to 10% by weight of an ethylenically unsaturated monocarboxylic acid monomer unit.

6. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein the particulate binder B contains 1% by weight to 10% by weight of an ethylenically unsaturated dicarboxylic acid monomer unit.

7. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein a weight ratio of the particulate binder A with respect to the particulate binder (particulate binder A)/(the particulate binder B) is 0.01 to 1.

8. The slurry composition for a lithium ion secondary battery negative electrode according to claim 1, wherein the particulate binder A has a surface acid amount of 0.01 meq/g or more and 0.097 meq/g or less.