Method for manufacturing electrode assembly for all-solid-state battery

Patent metadata

Field	Value
Publication number	US-2026031320-A1
Application number	US-202519092502-A
Country	US
Kind code	A1
Filing date	Mar 27, 2025
Priority date	Jul 29, 2024
Publication date	Jan 29, 2026
Grant date	—

Abstract

An electrode assembly is produced by partially drying an electrode slurry (20-50% dryness), then coating a solid electrolyte slurry with controlled viscosity (1,000-10,000 cP) and solids content (40-80 wt %). Both slurries are dried at 60-120° C., while the ratio of solid electrolyte slurry viscosity to electrode slurry viscosity (0.2-1.0) reduces interlayer mixing. The degree of dryness is determined by comparing residual solvent in the partially dried layer to the original slurry. This approach yields a uniform interface between the electrode and electrolyte. A corresponding method for an all-solid-state battery encloses the resulting electrode assembly, along with an anode layer, in a battery casing, ensuring enhanced interface stability.

First claim

What is claimed is:

1 . A method for manufacturing an electrode assembly, the method comprising:
coating an electrode slurry on an electrode current collector, partially drying the electrode slurry to a degree of dryness ranging from about 20% to about 50% to form an electrode layer; coating a solid electrolyte slurry on the electrode layer formed; and drying the solid electrolyte slurry, wherein the degree of the dryness is calculated through following Equation 1,

Degree
⁢

of
⁢

dryness

=

{

1
-

(

content
⁢

of
⁢

solvent
⁢

in
⁢

the
⁢

electrode
⁢

layer
⁢

formed
⁢

after
⁢

the
⁢

partial
⁢

drying

)

/

(

content
⁢

of
⁢

solvent
⁢

in
⁢

the
⁢

coated
⁢

electrode
⁢

slurry

)

}

*
100
⁢

%
.

[

Equation
⁢

1

]

2 . The method of claim 1 , wherein a solid content of the electrode slurry ranges from about 40 wt % to about 80 wt %.

3 . The method of claim 1 , wherein a viscosity of the electrode slurry ranges from about 1,000 cP to about 10,000 cP.

4 . The method of claim 1 , wherein the partially drying the electrode slurry to a degree of dryness ranging from 20% to 50% is performed at a temperature ranging from about 60° C. to about 120° C.

5 . The method of claim 1 , wherein a solid content of the solid electrolyte slurry ranges from about 40 wt % to about 80 wt %.

6 . The method of claim 1 , wherein a viscosity of the solid electrolyte slurry ranges from about 1,000 cP to about 10,000 cP.

7 . The method of claim 1 , wherein a ratio of a viscosity of the solid electrolyte slurry to a viscosity of the electrode slurry ranges from about 0.2 to about 1.0.

8 . The method of claim 1 , wherein the drying the solid electrolyte slurry is performed at a temperature ranging from about 60° C. to about 120° C.

9 . A method for manufacturing an electrode assembly, the method comprising:
providing an electrode slurry having a solid content of 40 wt % to 80 wt % and a viscosity of 1,000 cP to 10,000 cP at 25° C.; coating the electrode slurry on a current collector; partially drying the coated electrode slurry so that a degree of dryness is from about 20% to about 50% to form an incompletely dried electrode layer, providing a solid electrolyte slurry having a solid content of 40 wt % to 80 wt % and a viscosity of about 1,000 cP to about 10,000 cP at 25° C.; coating the solid electrolyte slurry on the incompletely dried electrode layer, and drying the solid electrolyte slurry at a temperature ranging from about 60° C. to about 120° C., wherein a ratio of a viscosity of the solid electrolyte slurry to a viscosity of the electrode slurry is from about 0.2 to about 1.0, and the degree of dryness is calculated by the following Equation (1):

Degree
⁢

of
⁢

dryness

=

{

1
-

(

content
⁢

of
⁢

solvent
⁢

in
⁢

the
⁢

electrode
⁢

layer
⁢

formed
⁢

after
⁢

the
⁢

partial

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Lee Ju Yeon
• Rim Jae Hyun
• Chung Gyeong Jun
• Kim Yoon Gon
• Kim Jong Jung
• Han Yoon Jae
• Choi Chang Young
• Kim Sang Mo
• Kim Dong Hyun

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/0471

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