Title:
METHOD FOR PREPARING CARBOXYMETHYL CELLULOSE OR SALT THEREOF, AND BINDER FOR ELECTRODE
Document Type and Number:
WIPO Patent Application WO/2017/145904
Kind Code:
A1
Abstract:
Provided is a carboxymethyl cellulose or a salt thereof, wherein, when the carboxymethyl cellulose or a salt thereof is used as a binder for an electrode of a non-aqueous electrolyte secondary battery, defects, such as pinholes, on the surface of the electrode are suppressed and the battery using the binder has an excellent capacity retention rate. Provided is a method for preparing a carboxymethyl cellulose or a salt thereof, the method comprising: an alkali cellulose conversion step (step 1) in which cellulose is reacted with an alkali in the presence of a mixed solvent containing water and an organic solvent; an etherification step (step 2) in which the obtained alkali cellulose is reacted with an etherifying agent; a purification step (step 3) in which the obtained reaction mixture is washed and dried, and a pulverization step (step 4) for pulverizing the obtained purified product, wherein step 1 is performed for a reaction time of 60-120 minutes under the conditions of a pH of 9 or higher and a reaction temperature of 5-25°C.
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Inventors:
KAKUBARI RYO (JP)
SANUKI ATSUSHI (JP)
SANUKI ATSUSHI (JP)
Application Number:
PCT/JP2017/005647
Publication Date:
August 31, 2017
Filing Date:
February 16, 2017
Export Citation:
Assignee:
DAI-ICHI KOGYO SEIYAKU CO LTD (JP)
International Classes:
C08B11/12; C08B1/08; H01M4/62
Domestic Patent References:
| WO2010061871A1 | 2010-06-03 |
Foreign References:
| JP2002536507A | 2002-10-29 | |||
| JPS6296501A | 1987-05-06 | |||
| JPH0655761B2 | 1994-07-27 | |||
| JP2013114959A | 2013-06-10 | |||
| JP2005108833A | 2005-04-21 | |||
| JPS5514734B2 | 1980-04-18 | |||
| JP2009191233A | 2009-08-27 |
Other References:
See also references of EP 3421501A4
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