Hydrophilic polymer, method of preparing the same, and lithium secondary battery containing the hydrophilic polymer

Patent metadata

Field	Value
Publication number	US-12590175-B2
Application number	US-202418649960-A
Country	US
Kind code	B2
Filing date	Apr 29, 2024
Priority date	Jun 15, 2022
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

The present disclosure relates to a hydrophilic polymer and a method for preparing the same. The hydrophilic polymer is characterized in that it is a copolymer of a conjugated diene, a monoolefin and a hydrophilic monomer represented by Formula I. In the Formula I, X 1 , X 2 and X 3 are each independently selected from hydrogen atoms, or a linear or branched alkyl with 1-4 carbon atoms. At least one of R 1 , R 2 and R 3 is hydrophilic group; and the others are each independently selected from hydrogen atoms or, an alkyl or alkoxy with 1-4 carbon atoms.

First claim

What is claimed is:

1 . A hydrophilic polymer, wherein the hydrophilic polymer is a copolymer of a conjugated diene, a monoolefin and a hydrophilic monomer represented by Formula I,

where X 1 and X 2 are hydrogen atoms, and X 3 is selected from alkyls with 1-4 carbon atoms;
at least one of R 1 , R 2 and R 3 is hydrophilic group; and others are each independently selected from hydrogen atoms, or an alkyl or alkoxy with 1-4 carbon atoms.

2 . The hydrophilic polymer according to claim 1 , wherein
the copolymer is a random copolymer; the conjugated diene is a conjugated diene with 4 or more carbon atoms, and selected from one or more of 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2,4-hexadiene, 1, 3-cyclohexadiene, 2-chloro-1,3-butadiene, and/or the monoolefin is an aromatic monovinyl compound, and selected from one or more of styrene, α-methylstyrene, p-tert-butylstyrene, butoxystyrene, vinyltoluene, chlorostyrene, and vinylnaphthalene.

3 . The hydrophilic polymer according to claim 1 , wherein the hydrophilic group is selected from at least one of a hydroxyl, an amino, and a carboxyl.

4 . The hydrophilic polymer according to claim 1 , wherein at least two of R 1 , R 2 and R 3 are hydrophilic groups and others are each independently selected from hydrogen atoms, or alkyl with 1-4 carbon atoms.

5 . The hydrophilic polymer according to claim 1 , wherein a number average molecular weight Mn thereof is 12×10 4 -17×10 4 .

6 . The hydrophilic polymer according to claim 1 , wherein in the hydrophilic polymer, a ratio of parts by mass of the conjugated diene, the monoolefin, and the hydrophilic monomer is 10-90:90-10:1-6.

7 . A method for preparing a hydrophilic polymer, comprising a step of polymerizing a conjugated diene, a monoolefin, and a hydrophilic monomer represented by Formula I,

where X 1 and X 2 are hydrogen atoms, and X 3 is selected from alkyls with 1-4 carbon atoms;
at least one of the R 1 , R 2 and R 3 is hydrophilic group; and others are each independently selected from hydrogen atoms, or an alkyl or alkoxy with 1-4 carbon atoms.

8 . The method for preparing a hydrophilic polymer according to claim 7 , wherein
a copolymer is a random copolymer; the conjugated diene is a conjugated diene with 4 or more carbon atoms, and selected from one or more of 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2,4-hexadiene, 1, 3-cyclohexadiene, 2-chloro-1,3-butadiene and/or the monoolefin is an aromatic monovinyl compound, and selected from one or more of styrene, α-methylstyrene, p-tert-butylstyrene, butoxystyrene, vinyltoluene, chlorostyrene, and vinylnaphthalene.

9 . The method for preparing a hydrophilic polymer according to claim 7 , wherein the hydrophilic group is selected from at least one of a hydroxyl, an amino, and a carboxyl.

10 . The method for preparing a hydrophilic polymer according to claim 7 , wherein at least two of R 1 , R 2 and R 3 are hydrophilic groups, and others are each independently selected from hydrogen atoms, or an alkyl with 1-4 carbon atoms.

11 . The method for preparing a hydrophilic polymer according to claim 7 , wherein a number average molecular weight Mn thereof is 12×10 4 -17×10 4 .

12 . The method for preparing a hydrophilic polymer according to claim 7 , wherein in the hydrophilic polymer, a ratio of parts by mass of the conjugated diene, the monoolefin, and the hydrophilic monomer is 10-90:90-10:1-6.

13 . An electrode active material slurry, comprising an electrode active material, a dispersion medium, and the hydrophilic polymer according to claim 1 .

14 . A lithium ion secondary battery, wherein the lithium ion secondary battery comprises a positive pole plate, a negative pole plate, a separator and an electrolyte; wherein the negative pole plate comprises a negative pole membrane layer prepared from the electrode active material slurry according to claim 13 .

15 . A battery pack, wherein the battery pack comprises the lithium ion secondary battery according to claim 14 .

16 . An electrical device, wherein the electrical device comprises the lithium ion secondary battery according to claim 14 .

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Zhou Xin
• Ai Shaohua
• Zhang Yuxi
• Zeng Qi
• Chen Yu

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C09D125/10

  with conjugated dienes · CPC title

• H01M10/0525

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