Catholytes for a solid-state battery

Patent metadata

Field	Value
Publication number	US-11967676-B2
Application number	US-202318320074-A
Country	US
Kind code	B2
Filing date	May 18, 2023
Priority date	Nov 30, 2021
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

Provided herein are compositions which are useful as electrolytes and/or catholytes in an electrochemical cell that includes a solid-state separator and a lithium-metal anode.

First claim

What is claimed is:

1. A catholyte solution comprising:
a lithium salt; and
sulfolane; and
ethylene sulfite;
wherein the ratio of sulfolane:(ethylene sulfite) is from 30:70 v/v to 50:50 v/v.

2. The catholyte solution of claim 1 , further wherein the solution is in contact with a solid-state electrolyte comprising lithium-stuffed garnet, wherein the solid-state electrolyte is a thin film.

3. The catholyte solution of claim 1 , wherein the lithium salt is selected from the group consisting of LiPF 6 , Lithium bis(oxalato)borate (LiBOB), lithium bis(perfluoroethanesulfonyl)imide (LIBETI), bis(trifluoromethane)sulfonimide (LiTFSI), LiBF 4 , LiClO 4 , LiAsF 6 , lithium bis(fluorosulfonyl)imide (LiFSI), LiF, LiCl, LiBr, LiI, and combinations thereof.

4. The catholyte solution of claim 1 , wherein the lithium salt is LiPF 6 or LiBF 4 .

5. The catholyte solution of claim 1 , wherein the lithium salt is 1.4M LiPF 6 ; 1.4M LiBF 4 ; or 1.6M LiBF 4 .

6. The catholyte solution of claim 1 , wherein the lithium salt is present at a concentration of about 0.5 M to about 2.0 M.

7. An electrochemical cell comprising the catholyte solution of claim 1 .

8. The catholyte solution of claim 1 , further comprising 1,3-propane sultone.

9. The catholyte solution of claim 1 , further comprising thiophene.

10. The catholyte solution of claim 1 , wherein the ratio of sulfolane:(ethylene sulfite) is 30:70 v/v.

11. The catholyte solution of claim 1 , wherein the ratio of sulfolane:(ethylene sulfite) is 50:50 v/v.

12. The catholyte solution of claim 1 , further comprising an additive selected from the group consisting of tris(trimethysilyl) phosphite; tris(trimethysilyl) phosphate; trimethoxyboroxine; vinyl ethylene carbonate; methylene methane disulfonate; prop-1-ene-1,3 sultone; 1,3-propane sultone; fluoroethylene carbonate; LiTFSi; LiBOB; succinonitrile, trimethylene sulfate; triallyl phosphate; tris(trimethylsilyl) borate; tris(pentafluorophenyl) borane; tris(pentafluorophenyl)borane; methyl acetate; tris(trimethylsilyl) acetate; tris(trimethylsilyl) pyridine; tris(trimethylsilyl) methacrylate; tris (2,2,2-trifluoroethyl) phosphite; tris(2,2,2-trifluoroethyl) borate; and combinations thereof.

13. The catholyte solution of claim 12 , wherein the additive is TTSP i .

14. The catholyte solution of claim 12 , wherein the additive is TTSP a .

15. The catholyte solution of claim 2 , wherein the solid-state electrolyte is a lithium-stuffed garnet characterized by a formula selected from the group consisting of Li A La B M′ C M″ D Zr E O F , Li A La B M′ C M″ D Ta E O F , and Li A La B M′ C M″ D Nb E O F , wherein 4<A<8.5, 1.5<B<4, 0≤C<2.5, 0≤D<2.5; 0<E<2.5, 10<F<14, and wherein M′ and M″ are each, independently, selected from the group consisting of Al, Mo, W, Nb, Ga, Y, Gd, Sb, Ca, Ba, Sr, Ce, Hf, Rb, and Ta.

16. The catholyte solution of claim 1 , wherein the catholyte solution has a boiling point within a range from 60° C. to 100° C.

17. A method for making catholyte solution, comprising:
mixing sulfolane and ethylene sulfite, and wherein the ratio of sulfolane:(ethylene sulfite) is from 30:70 v/v to 50:50 v/v; and
a lithium salt; thereby providing a catholyte solution.

18. A catholyte solution comprising:
a lithium salt; and
two C 3-10 heterocyclic molecules, wherein a ratio of one C 3-10 heterocyclic molecule to the other C 3-10 heterocyclic molecules is from 30:70 v/v to 50:50 v/v;
wherein at least one C 3-10 heterocyclic molecules is sulfolane; and
wherein at least one C 3-10 heterocyclic molecules is ethylene sulfite.

Assignees

• Quantumscape Battery Inc

Inventors

• Chan Jan
• Yang Aram

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title