Method of manufacturing negative electrode for all-solid-state batteries

Patent metadata

Field	Value
Publication number	US-12401016-B2
Application number	US-202017608555-A
Country	US
Kind code	B2
Filing date	May 13, 2020
Priority date	May 24, 2019
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

Disclosed is a method of manufacturing a negative electrode for all-solid-state batteries, the method including (a) preparing a powder mixture including a negative electrode active material, a solid electrolyte, and a conductive agent, (b) introducing the powder mixture into a reactor, (c) introducing an electrolytic solution into the reactor, and (d) forming a solid electrolyte interface (SEI) film while rotating the reactor, wherein the inner surface of the reactor is treated with lithium metal.

First claim

The invention claimed is:

1. A method of manufacturing a negative electrode for all-solid-state batteries, the method comprising:
step (a) preparing a powder mixture comprising a negative electrode active material, a solid electrolyte, and a conductive agent;
step (b) introducing the powder mixture into a reactor having its inner surface previously treated with a lithium metal, rotating the resultant reactor, and forming a first solid electrolyte interface (SEI) film;
step (c) introducing an electrolytic solution into the reactor obtained from step (b); and
step (d) forming a second solid electrolyte interface (SEI) film while rotating the reactor obtained from step (c).

2. The method according to claim 1 , wherein step (c) further comprises adding an additive.

3. The method according to claim 1 , wherein the electrolytic solution is a cyclic carbonate-based electrolytic solution.

4. The method according to claim 1 , wherein step (d) comprises heating the reactor.

5. The method according to claim 1 , further comprising washing and drying materials in the reactor after step (d).

6. The method according to claim 5 , further comprising filtering a residue using a sieve after the drying.

7. The method according to claim 1 , wherein the solid electrolyte is an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or a polymer-based solid electrolyte.

8. The method according to claim 1 , wherein
the second SEI film comprises a main product and a by-product, and
the main product consists of an organic material comprising lithium, and the main product is stably maintained in a state of being attached to the negative electrode active material.

9. The method according to claim 2 , wherein the additive is at least one selected from the group consisting of vinyl carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, and succinonitrile.

10. The method according to claim 4 , wherein the reactor is heated to maintain in a temperature of 45° C. to 70° C.

Assignees

• Lg Energy Solution Ltd

Inventors

• Ryu Ji Hoon
• Kim Eun Bee
• Lee Jung Pil
• Lee Suk Woo

Classifications

• H01M2300/0082

  Organic polymers · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0565

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

• H01M10/0525

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

• H01M4/625

  Carbon or graphite · CPC title