Method of manufacturing cathode active material for all-solid-state battery

Patent metadata

Field	Value
Publication number	US-2022302432-A1
Application number	US-202117525440-A
Country	US
Kind code	A1
Filing date	Nov 12, 2021
Priority date	Mar 18, 2021
Publication date	Sep 22, 2022
Grant date	—

Abstract

Disclosed is a method of manufacturing a cathode active material for an all-solid-state battery by using sonication. The method includes: preparing a cathode active material; preparing a coating solution, the coating solution including a lithium-containing precursor and a transition-metal-containing precursor; preparing an admixture by adding the cathode active material to the coating solution; sonicating the admixture at a first temperature; and forming a coating layer including a lithium transition metal oxide on the cathode active material by heat-treating a resultant of the sonicating at a second temperature that is a temperature higher than the first temperature.

First claim

What is claimed is:

1 . A method of manufacturing a cathode active material for an all-solid-state battery, comprising:
admixing a cathode active material and a coating composition comprising a lithium-containing precursor and a transition-metal-containing precursor to provide an admixture; sonicating the admixture.

2 . The method of claim 1 further comprising heating the admixture.

3 . The method of claim 2 wherein the admixture is heat-treated after sonicating.

4 . The method of claim 2 wherein the admixture is sonicated at a first temperature and following sonicating the admixture is heat-treated at a second temperature higher than the first temperature.

5 . The method of claim 1 comprising: preparing a cathode active material;
preparing a coating solution comprising a lithium-containing precursor and a transition-metal-containing precursor;
preparing an admixture a cathode active material to the coating solution;
sonicating the admixture at a first temperature; and
heat-treating a resultant of the sonicating.

6 . The method of claim 1 , wherein the cathode active material comprises an oxide-based cathode active material.

7 . The method of claim 1 , wherein the cathode active material comprises LiNi 1-x-y Co x Mn y Al z O 2 (in which x, y, and z are numbers in following ranges: 0<x, 0<y, 0<z, and 0<x+y+z≤0.4).

8 . The method of claim 1 , wherein the lithium-containing precursor comprises lithium ethoxide.

9 . The method of claim 1 , wherein the transition-metal-containing precursor comprises one or more selected from the group consisting of niobium ethoxide, vanadium ethoxide, and zirconium ethoxide.

10 . The method of claim 1 , wherein energy in an amount such that a metal does not precipitate from the lithium-containing precursor and from the transition-metal-containing precursor is transferred to the admixture by the sonicating.

11 . The method of claim 1 , wherein the first temperature is about 50° C. to 70° C.

12 . The method of claim 1 , wherein a powder state resultant is obtained by removing a solvent in the admixture following sonicating.

13 . The method of claim 5 , wherein the resultant of the sonicating is heat-treated in an oxygen atmosphere.

14 . The method of claim 3 , wherein the heat-treating is performed at a temperature of about 300° C. to 350° C.

15 . The method of claim 2 , wherein the reaction product provided following heating comprises:
a core layer comprising a cathode active material; and a coating layer coated on all or part of a surface of the core layer, wherein the coating layer comprises one or more selected from the group consisting of LiNbO 3 , LiNb 3 O 8 , Li 3 NbO 4 , LiNbO 2 , Li 8 Nb 2 O 9 , LiV 3 O 8 , LiVO 2 , LiVO 4 , Li 3 VO 4 , LiVO 3 , LiV 2 O 5 , LiV 2 O 4 , Li 2 V 18 O 39 , LiV 6 O 13 , Li 2 V 6 O 13 , Li 2 ZrO 3 , and Li 6 Zr 2 O 7 .

16 . A method of manufacturing a cathode for an all-solid-state battery, comprising:
preparing a starting material, the starting material comprising the cathode active material of claim 1 and a solid electrolyte; and manufacturing a cathode by using the starting material.

17 . The method of claim 16 , wherein the solid electrolyte comprises a sulfide-based solid electrolyte.

18 . The method of claim 16 , wherein the cathode has a lithium-ion conductivity of about 4.0×10 −4 S/cm to 6.0×10 −4 S/cm.

19 . A cathode prepared by a method of claim 16 .

20 . A battery comprising the cathode of claim 19 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Noh Sung Woo
• Lee Sang Heon
• Park Je Sik
• Seo Jeong Hyun
• Seong Ju Yeong
• Ha A Reum

Classifications

• H01M4/505 Primary

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

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title