Electrode binder slurry composition for lithium ion electrical storage devices

Patent metadata

Field	Value
Publication number	US-12463220-B2
Application number	US-202318479154-A
Country	US
Kind code	B2
Filing date	Oct 2, 2023
Priority date	Jul 7, 2017
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

The present invention provides a slurry composition comprising a binder comprising a polymer comprising a fluoropolymer dispersed in a liquid medium; an adhesion promoter; and at least one of an electrochemically active material or an electrically conductive agent. The present invention also provides electrodes and electrical storage devices.

First claim

What is claimed is:

1 . A slurry composition comprising:
(a) an electrochemically active material; (b) a binder comprising a polymer comprising a fluoropolymer dispersed in an organic medium comprising a primary solvent and a co-solvent, wherein the primary solvent comprises butyl pyrrolidone, a trialkylphosphate, 3-methoxy-N,N-dimethylpropanamide, 1,2,3-triacetoxypropane, or combinations thereof, and the co-solvent comprises ethyl acetoacetate, gamma-butyrolactone, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol monopropyl ether, diethylene glycol monobutyl ether, ethylene glycol monohexyl ether, or combinations thereof; and (c) an adhesion promoter.

2 . The slurry composition of claim 1 , wherein the adhesion promoter comprises a polyvinylidene fluoride copolymer.

3 . The slurry composition of claim 2 , wherein the polyvinylidene fluoride copolymer comprises constitutional units comprising the residue of vinylidene fluoride and at least one of:
(i) (meth)acrylic acid; or (ii) hydroxyalkyl (meth)acrylate.

4 . The slurry composition of claim 3 , wherein the (meth)acrylic acid comprises acrylic acid.

5 . The slurry composition of claim 3 , wherein the hydroxyalkyl (meth)acrylate comprises a C 1 to C 5 hydroxyalkyl (meth)acrylate.

6 . The slurry composition of claim 5 , wherein the C 1 to C 5 hydroxyalkyl (meth)acrylate comprises hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, or combinations thereof.

7 . The slurry composition of claim 1 , wherein the primary solvent comprises triethylphosphate, and the co-solvent comprises ethyl acetoacetate.

8 . The slurry composition of claim 1 , wherein the organic medium has a temperature at which the fluoropolymer disperses and an evaporation rate less than 10 grams per square meter per minute, at that temperature.

9 . The slurry composition of claim 8 , wherein the organic medium has an evaporation rate greater than 80 grams per square meter per minute, at 180° C.

10 . The slurry composition of claim 1 , further comprising an electrically conductive agent.

11 . The slurry composition of claim 10 , wherein the electrically conductive agent comprises graphite, acetylene black, furnace black, graphene, carbon nanotubes, or combinations thereof.

12 . The slurry composition of claim 10 , wherein the electrically conductive agent comprises carbon nanotubes.

13 . The slurry composition of claim 10 , wherein the electrically conductive agent comprises conductive carbon material having a surface area of 100 m 2 /g to 1000 m 2 /g.

14 . The slurry composition of claim 1 , wherein the slurry is substantially free of isophorone.

15 . The slurry composition of claim 1 , wherein the slurry is substantially free of N-methyl-2-pyrrolidone.

16 . A slurry composition comprising:
(a) an electrically conductive agent; (b) a binder comprising a polymer comprising a fluoropolymer dispersed in an organic medium comprising a primary solvent and a co-solvent, wherein the primary solvent comprises butyl pyrrolidone, a trialkylphosphate, 3-methoxy-N,N-dimethylpropanamide, 1,2,3-triacetoxypropane, or combinations thereof, and the co-solvent comprises ethyl acetoacetate, gamma-butyrolactone, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol monopropyl ether, diethylene glycol monobutyl ether, ethylene glycol monohexyl ether, or combinations thereof; and (c) an adhesion promoter.

17 . An electrode comprising:
(a) an electrical current collector; and (b) a film formed on the electrical current collector, wherein the film is deposited from the slurry composition of claim 1 .

18 . An electrical storage device comprising:
(a) the electrode of claim 17 ; (b) a counter electrode; and (c) an electrolyte.

19 . The electrical storage device of claim 18 , wherein the electrical storage device comprises a cell, a battery pack, a secondary battery, a capacitor, or a supercapacitor.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Hellring Stuart D
• Singer Debra L
• Stewart Matthew E
• Mohin Jacob W

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01G11/70

  characterised by their structure · CPC title

• H01G11/68

  characterised by their material · CPC title

• H01G11/62

  characterised by the solute, e.g. salts, anions or cations therein · CPC title

• H01G11/30

  characterised by their material · CPC title