Method of preparing lithium salt of carboxymethyl cellulose and rechargeable lithium battery comprising lithium salt of carboxymethyl cellulose prepared by same

Patent metadata

Field	Value
Publication number	US-2024209120-A1
Application number	US-202318481918-A
Country	US
Kind code	A1
Filing date	Oct 5, 2023
Priority date	Dec 16, 2022
Publication date	Jun 27, 2024
Grant date	—

Abstract

A method of preparing a lithium salt of carboxymethyl cellulose is provided. The method includes carrying out alkalization of cellulose in the presence of lithium hydroxide to generate an alkali product; and mixing the resulting product with a halogenated (e.g., halogen-including) acetic acid or a salt thereof to carry out etherification. An amine derivative is added to at least one of the alkalization or etherification.

First claim

What is claimed is:

1 . A method of preparing a lithium salt of carboxymethyl cellulose, the method comprising:
carrying out alkalization of cellulose and lithium hydroxide to form a resulting product; and mixing the resulting product with a halogenated acetic acid or a salt thereof to carry out etherification, wherein an amine derivative is added into the alkalization and/or the etherification.

2 . The method as claimed in claim 1 , wherein the amine derivative is represented by Chemical Formula 1 or Chemical Formula 2;

wherein, in Chemical Formula 1, R 1 , R 2 , and R 3 are the same or different, and are each hydrogen, or an unsubstituted or halogen-substituted C1-C12 alkyl group;

in Chemical Formula 2, R 4 , R 5 , R 7 , R 8 , and R 9 are the same or different, and are each hydrogen, or an unsubstituted or halogen-substituted C1-C12 alkyl group,
R 6 is a C1-C12 alkenyl group,
W 1 and We are the same or different and are each a C1 to C12 alkenyl group, and
a is an integer of about 0 to about 2.

3 . The method as claimed in claim 1 , wherein the amine derivative is dimethylamine, diethylamine, trimethylamine, triethylamine, chloroalkyl amine, bromoalkyl amine, bis(chloro alkyl)amine, tris(chloro alkyl)amine, ethylene diamine, diethylene triamine, triethylene tetraamine, or one or more combinations thereof.

4 . The method as claimed in claim 1 , wherein the halogenated acetic acid is chloroacetic acid, fluoroacetic acid, bromoacetic acid, iodineacetic acid, or one or more combinations thereof.

5 . The method as claimed in claim 1 , wherein the salt of the halogenated acetic acid is a lithium salt of a halogenated acetic acid.

6 . The method as claimed in claim 1 , wherein an added amount of the amine derivative is 0.0001 parts by weight to 100 parts by weight based on 1 part by weight of the cellulose.

7 . The method as claimed in claim 1 , wherein the halogenated acetic acid or the salt thereof is added at an amount of about 0.1 parts by weight to about 100 parts by weight based on 1 part of the cellulose.

8 . The method as claimed in claim 1 , wherein the lithium salt of carboxymethyl cellulose has a degree of substitution of about 0.5 or more and about 1.5 or less.

9 . The method as claimed in claim 1 , wherein the alkalization is carried out in a solvent.

10 . The method as claimed in claim 9 , wherein the solvent is water, alcohol, or a combination thereof.

11 . A rechargeable lithium battery, comprising:
a negative electrode comprising the lithium salt of carboxymethyl cellulose prepared by the method as claimed in claim 1 ; a positive electrode; and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Cho Yunshik
• Cho Minho
• Kim Hana
• Lee Jungmin
• Lee Kukjoo
• Jung Kyunghwa

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/62

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

• C08B15/04 Primary

  Carboxycellulose, e.g. prepared by oxidation with nitrogen dioxide · CPC title

• H01M4/622

  being polymers · CPC title