Cathode active material for all-solid-state battery with controlled particle size and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2024120475-A1
Application number	US-202318312368-A
Country	US
Kind code	A1
Filing date	May 4, 2023
Priority date	Oct 5, 2022
Publication date	Apr 11, 2024
Grant date	—

Abstract

The present disclosure relates to a cathode active material for an all-solid-state battery with a controlled particle size and a method for preparing the same. In particular, the cathode active material includes lithium and a transition metal, wherein the cathode active material has a single peak in the range of 1 μm to 10 μm as a result of particle size distribution (PSD) analysis.

First claim

What is claimed is:

1 . A cathode active material for an all-solid-state battery comprising:
lithium; and a transition metal, wherein the cathode active material has a single peak in the range of 1 μm to 10 μm based on particle size distribution (PSD) analysis.

2 . The cathode active material of claim 1 , wherein the cathode active material is represented by Li 1+a M1 x M2 y M3 z M4 b O c ,
wherein M1, M2, and M3 each represents at least one of Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, B, or combinations thereof, M4 represents at least one of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, Cr, or combination thereof, and −0.02≤a≤0.20, x+y+z+b=1, 0≤x≤1, 0≤y≤0.5, 0≤z≤0.5, 0≤b≤0.1, and 2≤c≤2.02.

3 . The cathode active material of claim 1 , wherein the single peak has a full width at half maximum (FWHM) of 1 to 3.5.

4 . The cathode active material of claim 1 , wherein an area of the single peak based on PSD analysis is 45 to 60.

5 . The cathode active material of claim 1 , wherein a ratio of an area of the single peak based on PSD analysis to a full width at half maximum (FWHM) of the single peak is 23 to 40.

6 . A cathode for an all-solid-state battery, comprising;
the cathode active material of claim 1 ; and a sulfide-based solid electrolyte.

7 . A method for producing a cathode active material for an all-solid-state battery comprising:
preparing a starting material comprising a lithium precursor and a transition metal precursor; sieving the starting material to obtain an intermediate material; and heat-treating the intermediate material, wherein the cathode active material has a single peak in the range of 1 μm to 10 μm based on particle size distribution (PSD) analysis.

8 . The method of claim 7 , wherein the starting material is sieved with a mesh of 0.1 μm to 30 μm to obtain the intermediate material.

9 . The method of claim 7 , wherein the starting material is sieved for 10 hours to 50 hours to obtain the intermediate material.

10 . The method of claim 7 , wherein the cathode active material is represented by Li 1+a M1 x M2 y M3 z M4 b O c ,
wherein M1, M2, and M3 each represents at least one of Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, B, or combination thereof, M4 represents at least one of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, Cr, or combination thereof, and −0.02≤a≤0.20, x+y+z+b=1, 0≤x≤1, 0≤y≤0.5, 0≤z≤0.5, 0≤b≤0.1, and 2≤c≤2.02.

11 . The method of claim 7 , wherein the single peak has a full width at half maximum (FWHM) of 1 to 3.5.

12 . The method of claim 7 , wherein an area of the single peak based on PSD analysis is 45 to 60.

13 . The method of claim 7 , wherein a ratio of an area of the single peak based on PSD analysis to a full width at half maximum (FWHM) of the single peak is 23 to 40.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Noh Sung Woo
• Min Hong Seok
• Lee Sang Heon
• Seo Jeong Hyun
• Seo Im Sul
• Lim Chung Bum
• Seong Ju Yeong
• Park Je Sik

Classifications

• H01M2004/021

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/131

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

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title