Binder composition for lithium ion secondary battery electrodes, slurry composition for lithium ion secondary battery electrodes, electrode for lithium ion secondary batteries, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-9882216-B2
Application number	US-201414892967-A
Country	US
Kind code	B2
Filing date	Jun 3, 2014
Priority date	Jun 4, 2013
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

A binder composition for a lithium ion secondary battery electrode, including a particulate polymer and a water-soluble polymer, wherein the water-soluble polymer includes an ethylenically unsaturated carboxylic acid monomer unit in an amount of 20% by weight to 85% by weight, a carboxylic acid amide monomer unit in an amount of 0.1% by weight to 10% by weight, and a crosslinkable monomer unit in an amount of 0.1% by weight to 2.0% by weight.

First claim

The invention claimed is:

1. A slurry composition for a lithium ion secondary battery electrode, comprising an electrode active material, a particulate polymer, and a water-soluble polymer,
wherein the water-soluble polymer includes an ethylenically unsaturated carboxylic acid monomer unit in an amount of 20% by weight to 85% by weight, a carboxylic acid amide monomer unit in an amount of 0.1% by weight to 10% by weight, and a crosslinkable monomer unit in an amount of 0.1% by weight to 2.0% by weight,
the ethylenically unsaturated carboxylic acid monomer is at least one selected from the group consisting of ethylenically unsaturated mono-carboxylic acid and ethylenically unsaturated dicarboxylic acid,
the carboxylic acid amide monomer is at least one selected from the group consisting of (meth)acrylamide, N-2-dimethylaminoethyl(meth)acrylamide, and N-3-dimethylaminopropyl (meth)acrylamide, and
a weight ratio between the particulate polymer and the water-soluble polymer is: particular polymer/water-soluble polymer=72/28 to 50.0/50.0.

2. The slurry composition for a lithium ion secondary battery electrode according to claim 1 , wherein the water-soluble polymer has a weight average molecular weight of 5,000 to 200,000.

3. The slurry composition for lithium ion secondary battery electrodes according to claim 1 , comprising a carboxymethyl cellulose salt.

4. An electrode for a lithium ion secondary battery, comprising:
a current collector; and
an electrode active material layer obtained by applying, onto the current collector, the slurry composition for a lithium ion secondary battery electrode according to claim 1 , and drying the slurry composition.

5. A lithium ion secondary battery comprising a positive electrode, a negative electrode, and an electrolytic solution,
wherein the positive electrode, the negative electrode, or both the positive electrode and the negative electrode are the electrode for a lithium ion secondary battery according to claim 4 .

Assignees

• Zeon Corp

Inventors

• Sasaki Tomokazu

Classifications

• H01M2220/30

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

• H01M4/622

  being polymers · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01M10/0525

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

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title