METHOD FOR PRODUCING CARBOXYMETHYL CELLULOSE SALT FOR ELECTRODES OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Title:

Document Type and Number:

WIPO Patent Application WO/2016/031449

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a carboxymethyl cellulose salt for electrodes of nonaqueous electrolyte secondary batteries, which is capable of achieving a good balance between prevention of defects such as streaks and pin holes on a coated electrode surface and excellent bonding strength to a collector or excellent bonding strength between active materials. A production method which comprises: (1) an alkali cellulose formation reaction step wherein a mixed solvent that contains an alcohol having 3 or less carbon atoms and water at a mixing ratio (mass ratio) of from 75:25 to 95:5 is used and the alkali concentration relative to water is 25-40% by mass; (2) an etherification reaction step wherein a reaction is carried out in the presence of an excess alkali of 0.2-0.5 mol per unit of an anhydroglucose of the cellulose; (3) a neutralization step wherein an acid is added after the etherification reaction so that the pH of the reaction mixture is adjusted to 6.0-8.0; and (4) a heating step wherein the mixed solvent is removed and an alkali is added after the neutralization step so that the pH of the reaction mixture is adjusted to 8.0-9.0, and subsequently, a heat treatment is carried out at 40-70°C for 30-120 minutes.

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Inventors:

SANUKI ATSUSHI (JP)
OHZAKI MASANORI (JP)
SHIBATA MIHO (JP)

Application Number:

PCT/JP2015/070944

Publication Date:

March 03, 2016

Filing Date:

July 23, 2015

Export Citation:

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Assignee:

DAI ICHI KOGYO SEIYAKU CO LTD (JP)

International Classes:

C08B11/12

Domestic Patent References:

WO2010061871A1

2010-06-03

Foreign References:

JP2009144027A	2009-07-02
JP2000082472A	2000-03-21
JP2010070686A	2010-04-02
JP2014133825A	2014-07-24
JP2009191233A	2009-08-27
JP2008231186A	2008-10-02
JP2006348138A	2006-12-28
JP2005255799A	2005-09-22
JP2000264901A	2000-09-26

Other References: