Dispersant and method of preparation thereof, slurry composition and method of preparation thereof, electrode plate and apparatus containing the electrode plate

Patent metadata

Field	Value
Publication number	US-12415956-B2
Application number	US-202318382648-A
Country	US
Kind code	B2
Filing date	Oct 23, 2023
Priority date	Jul 8, 2022
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The present application provides a dispersant and a preparation method thereof, a slurry composition and a preparation method thereof, an electrode, and an apparatus containing the electrode plate. The dispersant includes a block copolymer having a first block and a second block, the first block includes a first repeating structural unit shown in Formula I) and a second repeating structural unit shown in Formula II), and the second block includes a third repeating structural unit shown in Formula III) and a fourth repeating structural unit shown in Formula IV), in which n is any integer from 1-25, R 1 to R 7 are independently selected from hydrogen, halogen, cyano, carbonyl, carboxy, nitro, sulfonyl, amide, ester, substituted or unsubstituted C 1 -C 15 alkyl or alkoxy, and substituted or unsubstituted C 6 -C 30 aryl and R 8 , R 9 , and R 10 have a dipole moment of greater than 2×10 −30 C·m.

First claim

What is claimed is:

1. A dispersant, comprising a block copolymer having a first block and a second block, wherein
said first block comprises a first repeating structural unit shown in Formula I) and a second repeating structural unit shown in Formula II):

in which R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are independently selected from hydrogen, halogen, cyano, carbonyl, carboxy, nitro, sulfonyl, amide, ester, substituted or unsubstituted C 1 -C 15 alkyl, substituted or unsubstituted C 1 -C 15 alkoxy, and substituted or unsubstituted C 6 -C 30 aryl; and
said second block comprises a third repeating structural unit shown in Formula III) and a fourth repeating structural unit shown in Formula IV):

in which n represents an average degree of polymerization, that is any integer from 1-25 and R 8 , R 9 and R 10 have a dipole moment of greater than 2×10 −30 C·m.

2. The dispersant as claimed in claim 1 , wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are independently selected from hydrogen, halogen, cyano, substituted or unsubstituted C 1 -C 12 alkyl, or substituted or unsubstituted C 6 -C 12 aryl.

3. The dispersant as claimed in claim 1 , wherein said first repeating structural unit has the following structural formula:

and
said second repeating structural unit is ethylene; optionally said first block is a random copolymerization block of said first repeating structural unit and said second repeating structural unit; optionally said first block has a weight average molecular weight in the range of 1000-500000; and optionally said second block has a weight average molecular weight in the range of 1000-500000.

4. The dispersant as claimed in claim 1 , wherein said first block and second block have a ratio of an average degree of polymerization in the range of (0.1-10): 1.

5. A method of preparing a dispersant as claimed in claim 1 , comprising:
dissolving an initiator and a chain transfer agent in an organic solvent and stirring them under an inert atmosphere to obtain a mixed solution;
adding monomers of a first block to said mixed solution for a first copolymerization reaction;
after the first copolymerization reaction is complete, adding monomers of the second block for a second copolymerization reaction; and
after the second copolymerization reaction is complete, the resulting product is precipitated, filtered and dried, thereby obtaining said dispersant.

6. The method as claimed in claim 5 , wherein said stirring is carried out at rate in the range of 20 min/rpm-1500 min/rpm;
optionally, the first copolymerization reaction is carried out at a reaction temperature in the range of −20° C. to 120° C.

7. A slurry composition for forming an electrode film layer comprising the dispersant as claimed in claim 1 , a binder, an active material, and optionally a conductive agent.

8. The slurry composition as claimed in claim 7 , wherein said slurry composition comprises, relative to a total mass of the slurry composition, being 100%:
0.01%-10% of the dispersant;
0.5%-10% of a binder;
82%-91.99% of an active material; and
0%-15% of a conductive agent.

9. The slurry composition as claimed in claim 7 , wherein said active material is a positive electrode active material.

10. A method of preparing the slurry composition as claimed in claim 7 , comprising:
mixing a conductive agent, the dispersant, and a portion of a solvent with stirring to obtain a first mixture;
adding a binder to said first mixture with stirring for mixing to obtain a second mixture;
adding an active material and the remaining solvent to said second mixture with stirring for mixture to obtain said slurry composition.

11. An electrode plate, comprising,
a current collector;
an active material layer, disposed on at least one surface of said current collector, said active material layer being formed from the slurry composition as claimed in claim 7 .

12. A secondary battery, comprising,
a positive electrode plate;
a negative electrode plate; and
a separator, provided between said positive electrode plate and said negative electrode plate;
wherein said positive electrode plate and/or said negative electrode plate are the electrode plate as claimed in claim 11 .

13. A battery module comprising the secondary battery as claimed in claim 12 .

14. A battery pack comprising the battery module as claimed in claim 13 .

15. An electric device comprising the battery pack as claimed in claim 14 .

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Zhuo Guopeng
• Xu Yunpeng
• Wu Yanying
• Wang Xinghui

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C08F2438/03

  Use of a di- or tri-thiocarbonylthio compound, e.g. di- or tri-thioester, di- or tri-thiocarbamate, or a xanthate as chain transfer agent, e.g . Reversible Addition Fragmentation chain Transfer [RAFT] or Macromolecular Design via Interchange of Xanthates [MADIX] · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08F293/005

  using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent · CPC title