Electrode binder slurry composition for lithium ion electrical storage devices

Patent metadata

Field	Value
Publication number	US-11799086-B2
Application number	US-201816629124-A
Country	US
Kind code	B2
Filing date	Jul 6, 2018
Priority date	Jul 7, 2017
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

The present invention provides a slurry composition comprising an electrochemically active material and/or an electrically conductive agent, and a binder comprising a polymer comprising a fluoropolymer dispersed in an organic medium; wherein the organic medium has an evaporation rate less than 10 g/min m2, at the dissolution temperature of the fluoropolymer dispersed in the organic medium. 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; and
(b) a binder comprising a polymer comprising a fluoropolymer dispersed in an organic medium;
wherein the organic medium has an evaporation rate less than 10 grams per square meter per minute, at a dissolution temperature of the fluoropolymer dispersed in the organic medium;
wherein the organic medium comprises a primary solvent and a co-solvent, the primary solvent comprising butyl pyrrolidone, a trialkylphosphate, 3-methoxy-N,N-dimethylpropanamide, 1,2,3-triacetoxypropane, or combinations thereof, and the co-solvent comprising ethyl acetoacetate, gamma-butyrolacetone, propylebne glycol methyl ether, dipropylene glycol methyl ether, propylene glycol monopropyl ether, diethylene glycol monobutyl ether, ethylene glycol monohexyl ether, or combinations thereof, and
wherein the slurry composition further comprises a dispersant.

2. The slurry composition of claim 1 , wherein the electrochemically active material comprises a material capable of incorporating lithium.

3. The slurry composition of claim 2 , wherein material capable of incorporating lithium comprises LiCoO 2 , LiNiO 2 , LiFePO 4 , LiCoPO 4 , LiMnO 2 , LiMn 2 O 4 , Li(NiMnCo)O 2 , Li(NiCoAl)O 2 , carbon-coated LiFePO 4 , or a combination thereof.

4. The slurry composition of claim 1 , wherein the electrochemically active material comprises a material capable of lithium conversion.

5. The slurry composition of claim 4 , wherein the material capable of lithium conversion comprises sulfur, LiO 2 , FeF 2 and FeF 3 , Si, aluminum, tin, SnCo, Fe 3 O 4 , or combinations thereof.

6. The slurry composition of claim 1 , wherein the electrochemically active material comprises graphite, silicon compounds, tin, tin compounds, sulfur, sulfur compounds, or a combination thereof.

7. The slurry composition of claim 1 , wherein the fluoropolymer comprises a (co)polymer comprising the residue of vinylidene fluoride.

8. The slurry composition of claim 1 , wherein the fluoropolymer comprises a polyvinylidene fluoride polymer.

9. The slurry composition of claim 1 , wherein the dispersant comprises an addition polymer.

10. The slurry composition of claim 9 , wherein the addition polymer has a glass transition temperature less than 100° C.

11. The slurry composition of claim 9 , wherein the addition polymer has a glass transition temperature of −50° C. to +70° C.

12. The slurry composition of claim 9 , wherein the addition polymer comprises an active hydrogen group.

13. The slurry composition of claim 12 , wherein the active hydrogen group comprises at least one carboxylic acid group.

14. The slurry composition of claim 12 , wherein the active hydrogen group comprises at least one hydroxyl group.

15. The slurry composition of claim 9 , wherein the addition polymer comprises a (meth)acrylic polymer comprising constitutional units comprising the residue of methyl methacrylate.

16. The slurry composition of claim 15 , wherein the (meth)acrylic polymer further comprises constitutional units comprising the residue of ethylenically unsaturated monomer comprising a heterocyclic group.

17. The slurry composition of claim 16 , wherein the (meth)acrylic polymer comprises at least one epoxy functional group, and the epoxy functional group is post-reacted with a beta-hydroxy functional acid.

18. The slurry composition of claim 9 , wherein the dispersant is prepared by conventional free radical initiated solution polymerization of a mixture of ethylenically unsaturated monomers dissolved in a second organic medium.

19. The slurry composition of claim 18 , wherein the second organic medium used to prepare the dispersant is the same as the organic medium of the slurry composition.

20. The slurry composition of claim 18 , wherein the second organic medium comprises triethylphosphate.

21. The slurry composition of claim 1 , wherein fluoropolymer and the dispersant are not bound by a covalent bond.

22. The slurry composition of claim 9 , wherein the slurry composition further comprises a cross-linker.

23. The slurry composition of claim 1 , wherein the dispersant is self-crosslinking.

24. The slurry composition of claim 1 , wherein the organic medium has an evaporation rate at 180° C. greater than 80 grams per square meter per minute.

25. The slurry composition of claim 1 , further comprising (c) an electrically conductive agent.

26. The slurry composition of claim 25 , wherein the electrically conductive agent comprises activated carbon, acetylene black, furnace black, graphite, graphene, carbon nanotubes, carbon fibers, fullerene, or combinations thereof.

27. The slurry composition of claim 25 , wherein the electrically conductive agent comprises conductive carbon material having a surface area of 100 m 2 /g to 1000 m 2 /g.

28. The slurry composition of claim 25 , wherein the electrochemically active material (a) is present in amounts of 70 to 99 percent by weight; the binder (b) is present in amounts of 0.5 to 20 percent by weight and the electrically conductive agent (c) is present in amounts of 0.5 to 20 percent by weight, based on the total weight of solids in the slurry composition.

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

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

31. A slurry composition comprising:
(a) a binder comprising a polymer comprising a fluoropolymer dispersed in an organic medium; and
(b) an electrically conductive agent;
wherein the organic medium has an evaporation rate less than 10 grams per square meter per minute, at a dissolution temperature of the fluoropolymer dispersed in the organic medium;
wherein the organic medium comprises a primary solvent and a co-solvent, the primary solvent comprising butyl pyrrolidone, a trialkylphosphate, 3-methoxy-N,N-dimethylpropanamide, 1,2,3-triacetoxypropane, or combinations thereof, and the co-solvent comprising ehtyl acetoacetate, gamma-butylrolacetone, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol monopropyl ether, diethylene gylcol monobutyl ether, ethylene glycol monohexyl ether, or combinations thereof; and
wherein the slurry composition further comprises a dispersant.

32. 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 25 .

33. The electrode of claim 32 , wherein the electrical current collector (a) comprises a mesh, sheet or foil comprising copper or aluminum.

34. The electrode of claim 32 , wherein the electrode comprises a positive electrode.

35. The electrode of claim 32 , wherein the electrode comprises a negative electrode.

36. The electrode of claim 32 , wherein the film is cross-linked.

37. The electrode of claim 32 , wherein the electrical current collector is pretreated with a pretreatment composition.

38. An electrical storage device comprising:
(a) the electrode of claim 32 ;
(b) a counter electrode; and
(c) an electrolyte.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Hellring Stuart D
• Bezak Michael R
• Daughenbaugh Randy E
• Sisco Scott W
• Mohin Jacob W
• Munro Calum H
• Stewart Matthew

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01G11/30

  characterised by their material · CPC title

• H01M4/623 Primary

  fluorinated polymers · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title