Carboxymethylcellulose or salt thereof for electrodes of nonaqueous electrolyte secondary battery and aqueous solution thereof

Patent metadata

Field	Value
Publication number	US-9240583-B2
Application number	US-200913131395-A
Country	US
Kind code	B2
Filing date	Nov 26, 2009
Priority date	Nov 26, 2008
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

The present invention provides carboxymethylcellulose or a salt thereof that can prevent defects such as streaks and pinholes from occurring in the obtained electrode when it is used as a binder for an electrode of a nonaqueous electrolyte secondary battery. The present invention provides carboxymethylcellulose or a salt thereof of which ratio of a dry mass A to a dry mass B is less than 50 ppm when 2 liters of a 0.3 mass % aqueous solution of the dry mass B of the carboxymethylcellulose or a salt thereof is prepared, the entire amount of the aqueous solution is filtrated through a 250-mesh filter under a reduced pressure of −200 mmHg, and the dry mass A of a residue on the filter is measured after filtration. The applications of the carboxymethylcellulose or a salt thereof are also provided.

First claim

The invention claimed is:

1. A carboxymethylcellulose or a carboxylmethylcellulose salt, wherein:
when 2 liters of a 0.3 mass % aqueous solution of the carboxymethylcellulose or the carboxymethylcellulose salt having a dry mass B is prepared, and an entire amount of the aqueous solution is filtered through a 250-mesh filter under a reduced pressure of −200 mmHg, and a residue on the 250-mesh filter is measured to have a dry mass A after the filtration, then a ratio of the dry mass A to the dry mass B is less than 50 ppm;
the carboxymethylcellulose or the carboxylmethylcellulose salt has a volume cumulative 100% particle diameter of 31 μm or more and less than 50 μm, as measured by a laser diffraction-scattering particle size distribution meter with methanol as a dispersion medium;
the carboxymethylcellulose or the carboxylmethylcellulose salt satisfies all of the following (1), (2) and (3):
(1) has a degree of substitution with carboxymethyl per anhydrous glucose unit of 0.45 or more,
(2) has a degree of substitution with carboxymethyl per anhydrous glucose unit of 2.0 or less;
(3) a 1 mass % aqueous solution of the carboxymethylcellulose or the carboxymethylcellulose salt has a viscosity of 1,000 to 20,000 m Pa·s as measured at 25° C. by a B-type viscometer; and
the carboxymethylcellulose or the carboxylmethylcellulose salt is adapted to function as a binder for an electrode of a nonaqueous electrolyte secondary battery.

2. The carboxymethylcellulose or the carboxymethylcellulose salt of claim 1 , in the form of a mechanically pulverized product.

Assignees

• Hidaka Yasuhiro
• Fujiwara Kazuhiro
• Inoue Kazuhiko
• Satou Shinji
• Jujo Paper Co Ltd

Inventors

• Hidaka Yasuhiro
• Fujiwara Kazuhiro
• Inoue Kazuhiko
• Satou Shinji

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/621

  Binders · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title