Polymer binder, laminated porous film, battery, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-2023344077-A1
Application number	US-202318129410-A
Country	US
Kind code	A1
Filing date	Mar 31, 2023
Priority date	Dec 9, 2020
Publication date	Oct 26, 2023
Grant date	—

Abstract

A polymer binder having softening point of 60° C. to 100° C. including a copolymer formed by polymerizing a first monomer, a second monomer, and a third monomer. The first monomer includes at least one of compounds shown in formula (I) or formula (II). The second monomer includes at least one of compounds shown in formula (III) or formula (IV). The third monomer includes at least one of compounds shown in formula (V):

R 11 is selected from an alkyl group having 0 to 3 carbon atoms; n1 is an integer between 2 and 5; R 21 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms, and M is hydrogen or an alkali metal cation; R 22 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms; and R 31 is selected from an alkyl group having 1 to 5 carbon atoms.

First claim

What is claimed is:

1 . A polymer binder, comprising: a copolymer formed by polymerizing a first monomer, a second monomer, and a third monomer; wherein a softening point of the polymer binder is in a range of 60° C. to 100° C.; wherein the first monomer comprises at least one of compounds shown in structural formula (I) or structural formula (II), the second monomer comprises at least one of compounds shown in structural formula (III) or structural formula (IV), and the third monomer comprises at least one of compounds shown in structural formula (V):

wherein
in the formula (I), R 11 is selected from an alkyl group having 0 to 3 carbon atoms; in the formula (II), n1 is an integer between 2 and 5; in the formula (III), R 21 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms, and M is hydrogen or an alkali metal cation; in the formula (IV), R 22 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms; and in the formula (V), R 31 is selected from an alkyl group having 1 to 5 carbon atoms.

2 . The polymer binder according to claim 1 , wherein the first monomer comprises at least one of ethylene, propylene, butene, pentene, pentadiene, or butadiene; the second monomer comprises at least one of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, methacrylic acid, methacrylonitrile, or butadiene-acrylonitrile; and the third monomer comprises at least one of styrene, chlorostyrene, fluorostyrene, or methyl styrene.

3 . The polymer binder according to claim 1 , wherein based on a total mass of the copolymer, a mass ratio of the first monomer, the second monomer, and the third monomer is (15%-50%):(25%-75%):(10%-50%).

4 . The polymer binder according to claim 1 , wherein a melting point of the polymer binder is ≤120° C.

5 . The polymer binder according to claim 1 , wherein a particle size D50 of the polymer binder ranges from 200 nm to 3000 nm.

6 . The polymer binder according to claim 1 , wherein the polymer binder is a core-shell structure, and the core-shell structure comprises a shell layer and a core coated with the shell layer.

7 . The polymer binder according to claim 6 , wherein a material of the core is an inorganic heat-resistant filler.

8 . The polymer binder according to claim 7 , wherein the inorganic heat-resistant filler comprises at least one of aluminum oxide, magnesium hydroxide, calcium sulfate, or barium sulfate.

9 . The polymer binder according to claim 6 , wherein a thickness of the shell layer in the core-shell structure is 20 nm-1600 nm.

10 . A laminated porous film, comprising a porous substrate and a porous coating, wherein at least one surface of the porous substrate is coated with the porous coating, and the porous coating comprises a polymer binder; the polymer binder comprises a copolymer formed by polymerizing a first monomer, a second monomer, and a third monomer, wherein a softening point of the polymer binder is in a range of 60° C. to 100° C.; wherein the first monomer comprises at least one of compounds shown in structural formula (I) or structural formula (II), the second monomer comprises at least one of compounds shown in structural formula (III) or structural formula (IV), and the third monomer comprises at least one of compounds shown in structural formula (V):

wherein
in the formula (I), R 11 is selected from an alkyl group having 0 to 3 carbon atoms; in the formula (II), n1 is an integer between 2 and 5; in the formula (III), R 21 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms, and M is hydrogen or an alkali metal cation; in the formula (IV), R 22 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms; and in the formula (V), R 31 is selected from an alkyl group having 1 to 5 carbon atoms.

11 . The laminated porous film according to claim 10 , wherein the porous coating further comprises a thickener and a wetting agent, and a mass ratio of the polymer binder, the thickener, and the wetting agent is (98%-70%):(15%-1%):(15%-1%).

12 . The laminated porous film according to claim 10 , wherein the porous coating further comprises inorganic particles.

13 . The laminated porous film according to claim 12 , wherein the porous coating further comprises a thickener and a wetting agent, and a mass ratio of the inorganic particles, the polymer binder, the thickener, and the wetting agent is (97%-70%):(10%-1%):(10%-1%):(10%-1%).

14 . The laminated porous film according to claim 10 , wherein a forward projection area of the porous coating accounts for 20%-100% of a forward projection area of the porous substrate.

15 . A battery, wherein the battery comprises a laminated porous film, the laminated porous film comprises a porous substrate and a porous coating, wherein at least one surface of the porous substrate is coated with the porous coating, and the porous coating comprises a polymer binder, the polymer binder comprises a copolymer formed by polymerizing a first monomer, a second monomer, and a third monomer, wherein a softening point of the polymer binder is 60° C. to 100° C.; wherein the first monomer comprises at least one of compounds shown in structural formula (I) or structural formula (II), the second monomer comprises at least one of compounds shown in structural formula (III) or structural formula (IV), and the third monomer comprises at least one of compounds shown in structural formula (V):

wherein
in the formula (I), R 11 is selected from an alkyl group having 0 to 3 carbon atoms; in the formula (II), n1 is an integer between 2 and 5; in the formula (III), R 21 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms, and M is hydrogen or an alkali metal cation; in the formula (IV), R 22 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms; and in the formula (V), R 31 is selected from an alkyl group having 1 to 5 carbon atoms.

16 . The battery according to claim 15 , wherein the first monomer comprises at least one of ethylene, propylene, butene, pentene, pentadiene, or butadiene; the second monomer comprises at least one of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, methacrylic acid, methacrylonitrile, or butadiene-acrylonitrile; and the third monomer comprises at least one of styrene, chlorostyrene, fluorostyrene, or methyl styrene.

17 . The battery according to claim 15 , wherein based on a total mass of the copolymer, a mass ratio of the first monomer, the second monomer, and the third monomer is (15%-50%):(25%-75%):(10%-50%).

18 . The battery according to claim 15 , wherein a melting point of the polymer binder is ≤120° C.

19 . The battery according to claim 15 , wherein a particle size D50 of the polymer binder ranges from 200 nm to 3000 nm.

20 . The battery according to claim 15 , wherein the polymer binder is a core-shell structure, and the core-shell structure comprises a shell layer and a core coated with the shell layer.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Qiu Bin
• Fan Xiaohe
• Wei Zengbin

Classifications

• H01M50/461

  with adhesive layers between electrodes and separators · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M50/42 Primary

  Acrylic resins · CPC title

• C08F220/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title