Method for manufacturing electrode comprising polymer-based solid electrolyte and electrode manufactured by the method

Patent metadata

Field	Value
Publication number	US-11978853-B2
Application number	US-201917269128-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Sep 28, 2018
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

The present disclosure relates to an electrode for an all solid-state battery and a manufacturing method thereof, and a mixture of a polymer-based solid electrolyte and a conductive material is filled between electrode active material particles that constitute an electrode active material layer, to increase the contact between the electrode active material particles and the conductive material through a solvent annealing process included in a manufacturing process, thereby improving ionic conductivity in the electrode and capacity in the electrode.

First claim

What is claimed is:

1. An electrode for an all solid-state battery, the electrode comprising:
electrode active material particles, a first polymer-based solid electrolyte, a second polymer-based solid electrolyte and a conductive material, wherein at least part of surfaces of the electrode active material particles is coated with a first coating layer including a mixture of the first polymer-based solid electrolyte and the conductive material, at least part of either surfaces of the first coating layer or surfaces of the active material particles or surfaces of both is coated with the second polymer-based solid electrolyte, and the electrode active materials are bonded together in the electrode by at least one of the first polymer-based solid electrolyte or the second polymer-based solid electrolyte to form an integrated structure, and the first polymer-based solid electrolyte and the second polymer-based solid electrolyte are in a swollen state.

2. The electrode for an all solid-state battery according to claim 1 , wherein the first and second polymer-based solid electrolytes are derived from a result of performing a solvent annealing process by a vaporized solvent.

3. The electrode for an all solid-state battery according to claim 1 , wherein the first polymer-based solid electrolyte and the second polymer-based solid electrolytes comprise a swellable polymer.

4. The electrode for an all solid-state battery according to claim 2 , wherein the vaporized solvent comprises at least one of an aprotic solvent selected from N,N-dimethylacetamide (DMAc), N-methyl pyrrolidone (NMP), dimethyl sulfoxide (DMSO) or N,N-dimethylformamide (DMF); or a protic solvent selected from water, methanol, ethanol, propanol, n-butanol, isopropyl alcohol, decalin, acetic acid or glycerol.

5. The electrode for an all solid-state battery according to claim 1 , wherein the first polymer-based solid electrolyte and the second polymer-based solid electrolyte are different from each other.

6. The electrode for an all solid-state battery according to claim 5 , wherein the first polymer-based solid electrolyte comprises at least one of polypropylene carbonate, a polycarbonate-based polymer electrolyte, a polysiloxane-based polymer electrolyte, a phosphazene-based polymer electrolyte or a polyether-based polymer electrolyte.

7. The electrode for an all solid-state battery according to claim 5 , wherein the second polymer-based solid electrolyte comprises polyethylene oxide (PEO).

8. A method for manufacturing the electrode according to claim 1 , comprising:
preparing a first coating layer slurry comprising the electrode active material particles, the first polymer-based solid electrolyte and the conductive material;
coating the first coating layer slurry on at least one surface of a current collector to prepare a first preliminary electrode;
preparing an electrolyte solution comprising the second polymer-based solid electrolyte and a solvent;
impregnating the first preliminary electrode with the electrolyte solution and drying to prepare a second preliminary electrode; and
performing a solvent annealing process on the second preliminary electrode to manufacture the electrode,
wherein the first polymer-based solid electrolyte corresponding to part of a total amount of a polymer-based solid electrolyte is put into the first coating layer slurry, and the second polymer-based solid electrolyte corresponding to a remaining amount is put into the electrolyte solution.

9. The method according to claim 8 , wherein the polymer-based solid electrolyte is a polymer electrolyte formed by adding a polymer resin to a solvated lithium salt.

10. The method according to claim 8 , wherein the solvent annealing process comprises:
putting the second preliminary electrode in an airtight space;
filling the airtight space with a vaporized solvent; and
maintaining the second preliminary electrode in the airtight space filled with the vaporized solvent.

11. The method according to claim 8 , wherein the solvent annealing process is performed for 1 to 72 hours.

12. The method according to claim 10 , wherein the vaporized solvent comprise at least one of an aprotic solvent selected from N,N-dimethylacetamide (DMAc), N-methyl pyrrolidone (NMP), dimethyl sulfoxide (DMSO) or N,N-dimethylformamide (DMF); or a protic solvent selected from water, methanol, ethanol, propanol, n-butanol, isopropyl alcohol, decalin, acetic acid or glycerol.

13. The method according to claim 8 , wherein a volume of the first polymer-based solid electrolyte and the second polymer-based solid electrolyte expands by permeation of a vaporized solvent during the solvent annealing process.

14. The method according to claim 8 , wherein the first polymer-based solid electrolyte and the second polymer-based solid electrolyte are different from each other.

15. The method according to claim 14 , wherein the first polymer-based solid electrolyte comprises at least one of polypropylene carbonate, a polycarbonate-based polymer electrolyte, a polysiloxane-based polymer electrolyte, a phosphazene-based polymer electrolyte or a polyether-based polymer electrolyte.

16. The method according to claim 8 , wherein the first coating layer slurry comprises at least one of an oxidation stabilizing additive or a reduction stabilizing additive.

17. The method according to claim 8 , wherein the solvent annealing process is performed at a temperature of 20° C. to 150° C.

18. The method according to claim 13 , wherein the volume of the first polymer-based solid electrolyte and the second polymer-based solid electrolyte expands at a ratio of more than 1 vol % and 1,000 vol % or less.

19. The method according to claim 8 , wherein the second polymer-based solid electrolyte is included in an amount of 5 weight % to 70 weight % of the total amount of the polymer-based solid electrolyte.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Lee Jung-Pil
• Kim Eun-Bee
• Ryu Ji-Hoon
• Kang Sung-Joong

Classifications

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/139 Primary

  Processes of manufacture · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title