Method of manufacturing composite electrode for all-solid-state battery, and composite electrode for all-solid-state battery manufactured thereby

Patent metadata

Field	Value
Publication number	US-11876219-B2
Application number	US-202117407844-A
Country	US
Kind code	B2
Filing date	Aug 20, 2021
Priority date	Mar 22, 2021
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A method of manufacturing a composite electrode for an all-solid-state battery includes: preparing a precursor solution by mixing at least one solid electrolyte precursor and at least one polar solvent; stirring the precursor solution; preparing an electrode slurry by adding an active material to the stirred precursor solution; and heat-treating the electrode slurry and obtaining the composite electrode for the all-solid-state battery, wherein the composite electrode for the all-solid-state battery includes: the active material; and a coating layer disposed on the active material and including a solid electrolyte.

First claim

What is claimed is:

1. A method of manufacturing a composite electrode for an all-solid-state battery, the method comprising:
preparing a precursor solution by mixing at least one solid electrolyte precursor and at least one polar solvent;
stirring the precursor solution;
preparing an electrode slurry by adding an active material to the stirred precursor solution; and
heat-treating the electrode slurry and obtaining the composite electrode for the all-solid-state battery,
wherein the composite electrode for the all-solid-state battery comprises: the active material; and a coating layer disposed on the active material and including a solid electrolyte, and
wherein a mass ratio of the solid electrolyte precursor to the polar solvent in the precursor solution is 8-10:1.

2. The method of claim 1 , wherein the solid electrolyte precursor comprises any one selected from a group consisting of Li 2 S, P 2 S 5 , LiCl, LiBr, LiI, and a mixture thereof.

3. The method of claim 1 , wherein the polar solvent comprises any one selected from a group consisting of cyclic ether, acetonitrile (ACN), ethanol (EtOH), and a mixture thereof.

4. The method of claim 1 , wherein stirring the precursor solution is performed at a stirring speed of 250 to 280 rpm.

5. The method of claim 1 , wherein, in preparing the electrode slurry, a mass ratio of the solid electrolyte precursor to the active material in the electrode slurry is 1:8-10.

6. The method of claim 1 , further comprising preparing an additional precursor solution including an additional solid electrolyte precursor that is different from the solid electrolyte precursor.

7. The method of claim 6 , wherein preparing the electrode slurry comprises:
preparing a mixture by adding the active material to the stirred precursor solution; and
adding the mixture with the additional precursor solution.

8. The method of claim 7 , wherein a mass ratio of the solid electrolyte precursor and the additional solid electrolyte precursor to the active material in the electrode slurry is 1:8-10.

9. The method of claim 1 , wherein, in preparing the electrode slurry, a conductive agent is further added in an amount of 0.1 to 0.5 wt % based on a total of 100 wt % of the electrode slurry.

10. The method of claim 1 , wherein heat-treating is performed at 140 to 160° C. for 1 to 3 hours.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Choi Sun Ho
• Jang Yong Jun
• Song In Woo
• Lee Sang Heon
• Lee Sang Soo
• Kim So Young
• Choi Seong Hyeon
• Kim Sa Heum
• Lim Jae Min

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M2300/008

  Halides · CPC title