High-molecular compound, intermediate composition, negative electrode, electrical storage device, slurry for negative electrode method for producing high-molecular compound, and method for producing negative electrode

Patent metadata

Field	Value
Publication number	US-9966607-B2
Application number	US-201515519977-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Oct 21, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A polymer compound for use as a binder for a negative electrode of an electrical storage device is formed by condensing polyacrylic acid and a multifunctional amine represented by the following formula (1), in which Y represents a straight chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom, and R1 and R2 each independently represent one or more hydrogen atoms, methyl groups, ethyl groups, trifluoromethyl groups, or methoxy groups.

First claim

The invention claimed is:

1. A method for producing a negative electrode of an electrical storage device, comprising forming a negative electrode active material layer to a collector using a slurry for a negative electrode, the slurry comprising:
an intermediate composition for a polymer compound for use as a binder for a negative electrode of an electrical storage device;
a negative electrode active material; and
a solvent, wherein the negative electrode active material is at least one selected from carbon-based materials capable of intercalating and deintercalating lithium, elements capable of producing alloy with lithium, and compounds including an element capable of producing alloy with lithium; and
wherein the intermediate composition comprises:
polyacrylic acid;
a multifunctional amine represented by the following formula (1); and
a nonaqueous solvent, wherein
Y represents a straight chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom, and
R1 and R2 each independently represent one or more hydrogen atoms, methyl groups, ethyl groups, trifluoromethyl groups, or methoxy groups

wherein, prior to being incorporated into the slurry, the intermediate layer is subjected to a preheating treatment at a temperature of 40° C. to 140° C.

2. The method for producing a negative electrode according to claim 1 , wherein the slurry for a negative electrode includes at least one selected from: silicon materials obtained from CaSi 2 through decalcification reaction; Si; and SiO v (0<v<2).

3. The method for producing a negative electrode according to claim 1 , wherein a compounding ratio of the polyacrylic acid and the multifunctional amine is made such that carboxy groups in the polyacrylic acid is 1.5 to 15 equivalents in relation to 1 equivalent of amino groups in the multifunctional amine.

4. A method for producing a negative electrode of an electrical storage device, comprising:
a preheating step of preheating an intermediate composition at a temperature of 40° C. to 140° C., the intermediate composition comprising:
polyacrylic acid;
a multifunctional amine represented by the following formula (1); and
a nonaqueous solvent, wherein
Y represents a straight chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom, and
R1 and R2 each independently represent one or more hydrogen atoms, methyl groups, ethyl groups, trifluoromethyl groups, or methoxy groups

an active material layer-forming step of forming a negative electrode active material layer on a collector using a mixture including the intermediate composition and a negative electrode active material; and
a condensation step of condensing the polyacrylic acid and the multifunctional amine by heat-treating the negative electrode active material layer.

5. The method for producing a negative electrode according to claim 4 , comprising drying and heat-treating the negative electrode active material layer in the condensation step.

6. The method for producing a negative electrode according to claim 4 , wherein a compounding ratio of the polyacrylic acid and the multifunctional amine is made such that carboxy groups in the polyacrylic acid is 1.5 to 15 equivalents in relation to 1 equivalent of amino groups in the multifunctional amine.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Sugiyama Yusuke
• Goda Nobuhiro
• Murase Masakazu
• Kondo Takeshi
• Kawamoto Yuta
• Abe Tomokuni
• Nakagawa Yuta
• Kaneda Jun

Classifications

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title

• H01M10/0525

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

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• C08F8/48

  Isomerisation; Cyclisation · CPC title

• C08F8/32 Primary

  by reaction with amines · CPC title