Slurry compositions for lithium-ion electrical storage devices

Patent metadata

Field	Value
Publication number	US-2024396006-A1
Application number	US-202218695849-A
Country	US
Kind code	A1
Filing date	Sep 30, 2022
Priority date	Sep 30, 2021
Publication date	Nov 28, 2024
Grant date	—

Abstract

The present invention provides a slurry composition comprising (a) a binder comprising at least one fluoropolymer; and (b) a solvent system comprising: (i) a molecule comprising a sulfoxide functional group; and (ii) a polybasic ester and/or glycol ether; and (c) an electrochemically active material and/or an electrically conductive agent. Also disclosed are electrodes, and electrical storage devices.

First claim

1 . A slurry composition comprising:
(a) a binder comprising at least one fluoropolymer; and (b) a solvent system comprising:
(i) a molecule comprising a sulfoxide functional group; and
(ii) a polybasic ester and/or glycol ether;
wherein the solvent system includes less than 1% by weight of a molecule comprising the structure R 1 C(═O)NR 2 R 3 , wherein R 1 is an aliphatic saturated group, that can be linear or branched, having 1 to 6 carbon atoms, and substituted by one or more functional groups comprising —C(═O)OR and —C(═O)NR 4 R 5 , R being an alkyl group having 1 to 6 carbon atoms, and R 4 and R 5 each independently are methyl or ethyl groups, and R 2 and R 3 each independently are methyl or ethyl groups, based on the weight of the solvent system; and
(c) an electrochemically active material and/or an electrically conductive agent.

2 . A slurry composition comprising:
(a) a binder comprising at least one fluoropolymer; and (b) a solvent system comprising:
(i) a molecule comprising a sulfoxide functional group; and
(ii) a polybasic ester and/or glycol ether comprising, consisting essentially of, or consisting of di(propylene glycol) methyl ether acetate; and
(c) an electrochemically active material and/or an electrically conductive agent.

3 - 4 . (canceled)

5 . The slurry composition of claim 1 , wherein the molecule comprising a sulfoxide functional group comprises dimethyl sulfoxide.

6 . The slurry composition of claim 1 , wherein the glycol ether comprises di(propylene glycol) methyl ether acetate.

7 . The slurry composition of claim 1 , wherein the polybasic ester comprises a dibasic ester.

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

9 . The slurry composition of claim 1 , wherein the fluoropolymer comprises a vinylidene fluoride copolymer.

10 . The slurry composition of claim 1 , wherein the fluoropolymer is solubilized in the solvent system at room temperature.

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

12 . (canceled)

13 . The slurry composition of claim 1 , further comprising a crosslinking agent.

14 . (canceled)

15 . The slurry composition of claim 1 , wherein the slurry composition has a viscosity of 5,000 to 25,000 cP at 10 s −1 , as measured by Anton Paar MCR 302 rheometer with a 50 mm diameter cone-plate.

16 . The slurry composition of claim 1 , wherein the slurry composition has a room temperature stability of ≥1 month.

17 . The slurry composition of claim 1 , wherein a film deposited from the slurry composition has a peel strength of at least 10 N/m, as measured by the PEEL STRENGTH TEST.

18 . The slurry composition of claim 1 , wherein the slurry composition has a solids content of 60% to 80% by weight.

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

20 . (canceled)

21 . The slurry composition of claim 1 , wherein the electrochemically active material comprises a material capable of lithium conversion comprising sulfur, LiO 2 , FeF 2 and FeF 3 , Si, aluminum, tin, SnCo, Fe 3 O 4 , or combinations thereof.

22 . (canceled)

23 . 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.

24 - 29 . (canceled)

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

31 . An electrode comprising:
(A) an electrical current collector; and (B) a film on the electrical current collector, wherein the film is deposited from the slurry composition of claim 1 , wherein the film optionally further comprises residual solvent comprising the solvent system.

32 - 36 . (canceled)

37 . An electrical storage device comprising:
(a) the electrode of claim 31 ; (b) a counter electrode; and (c) an electrolyte.

38 - 40 . (canceled)

Assignees

• Ppg Ind Ohio Inc

Inventors

• Li Zilu
• Yang Yurun
• Zhang Na
• Slyvester Kevin Thomas

Classifications

• H01M10/0525

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

• H01M4/623

  fluorinated polymers · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0569

  characterised by the solvents · CPC title