Electrode Slurry Composition for Lithium Ion Electrical Storage Devices

Patent metadata

Field	Value
Publication number	US-2020227752-A1
Application number	US-201816629203-A
Country	US
Kind code	A1
Filing date	Jul 6, 2018
Priority date	Jul 7, 2017
Publication date	Jul 16, 2020
Grant date	—

Abstract

The present invention provides a slurry composition comprising (a) a binder comprising a polymer comprising a fluocopolymer dispersed in a liquid medium; and (b) at least one conductive carbon material having a BET surface area of greater than 100 m 2 /g. Also provided are electrodes and electrical storage devices.

First claim

What is claimed is:

1 . A slurry composition comprising:
(a) a binder comprising a polymer comprising a fluoropolymer dispersed in a liquid medium; and (b) at least one conductive carbon material having a BET surface area of greater than 100 m 2 /g.

2 . The slurry composition of claim 1 , wherein the conductive carbon material has a BET surface area of 100.1 m 2 /g to 1,000 m 2 /g.

3 . The slurry composition of claim 1 , wherein the conductive carbon material has a BET surface area of 200 m 2 /g.

4 . The slurry composition of claim 1 , further comprising an electrochemically active material.

5 . The slurry composition of claim 4 , wherein
(a) the binder is present in amounts of 2 to 20 percent by weight; (b) the conductive carbon material is present in amounts of 2 to 20 percent by weight; and (c) the electrochemically active material is present in amounts of 45 to 96 percent by weight; the percentages by weight being based on total solids weight.

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

7 . The slurry composition of claim 6 , 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.

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

9 . The slurry composition of claim 8 , 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.

10 . The slurry composition of claim 4 , wherein the electrochemically active material comprises graphite, silicon compounds, tin, tin compounds, sulfur, sulfur compounds, or a combination thereof.

11 . The slurry composition of claim 4 , wherein the slurry has a total solids content of 55 percent by weight or greater and a viscosity of no more than 4,000 cP as measured by an Anton-Paar rheometer having a model number MCR301 using a 50-millimeter cone and temperature-controlled plate at 25° C.

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

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

14 . The slurry composition of claim 1 , further comprising a dispersant.

15 . The slurry composition of claim 14 , wherein the dispersant comprises an addition polymer.

16 . The slurry composition of claim 14 , wherein the addition polymer comprises an active hydrogen group.

17 . The slurry composition of claim 16 , wherein the active hydrogen group comprises at least one carboxylic acid group.

18 . The slurry composition of claim 16 , wherein the active hydrogen group comprises at least one hydroxyl group.

19 . The slurry composition of claim 14 , wherein the addition polymer comprises a (meth)acrylic polymer comprising constitutional units comprising the residue of methyl methacrylate.

20 . The slurry composition of claim 19 , wherein the (meth)acrylic polymer further comprises constitutional units comprising the residue of ethylenically unsaturated monomer comprising a heterocyclic group.

21 . The slurry composition of claim 20 , 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.

22 . The slurry composition of claim 14 , wherein the composition further comprises a cross-linker.

23 . The slurry composition of claim 1 , wherein the liquid medium comprises an organic medium.

24 . The slurry composition of claim 23 , wherein the organic medium has an evaporation rate less than 10 g/min m 2 , at the dissolution temperature of the fluoropolymer dispersed in the organic medium.

25 . The slurry composition of claim 1 , further comprising an adhesion promoter.

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

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

28 . 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 4 .

29 . The electrode of claim 28 , wherein the electrical current collector (a) comprises copper or aluminum in the form of a mesh, sheet or foil.

30 . The electrode of claim 28 , wherein the electrode comprises a positive electrode.

31 . The electrode of claim 28 , wherein the electrode comprises a negative electrode.

32 . The electrode of claim 28 , wherein the film is cross-linked.

33 . The electrode of claim 28 , wherein the electrical current collector is pretreated with a pretreatment composition.

34 . The electrode of claim 28 , wherein the film has a thickness of at least 1 micron.

35 . The electrode of claim 28 , wherein the film has a uniform composition.

36 . An electrical storage device comprising:

28 . electrode of claim 28 ;
(b) a counter electrode; and (c) an electrolyte.

37 . The electrical storage device of claim 36 , wherein the electrolyte (c) comprises a lithium salt dissolved in a solvent.

38 . The electrical storage device of claim 37 , wherein the lithium salt is dissolved in an organic carbonate.

39 . The electrical storage device of claim 36 , wherein the electrical storage device comprises a cell.

40 . The electrical storage device of claim 36 , wherein the electrical storage device comprises a battery pack.

41 . The electrical storage device of claim 36 , wherein the electrical storage device comprises a secondary battery.

42 . The electrical storage device of claim 36 , wherein the electrical storage device comprises a capacitor.

43 . The electrical storage device of claim 36 , wherein the electrical storage device comprises a supercapacitor.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Hellring Stuart D
• Stewart Matthew
• Daughenbaugh Randy E

Classifications

• H01G11/32

  Carbon-based · CPC title

• H01G11/48

  Conductive polymers · CPC title

• H01G4/008

  Selection of materials · CPC title

• H01M10/0525

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

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title