Cathode for all-solid-state battery and a method of manufacturing same

Patent metadata

Field	Value
Publication number	US-2024372078-A1
Application number	US-202318242947-A
Country	US
Kind code	A1
Filing date	Sep 6, 2023
Priority date	May 3, 2023
Publication date	Nov 7, 2024
Grant date	—

Abstract

Disclosed are a cathode for an all-solid-state battery including a composite-coated or double-coated cathode active material and a method of manufacturing the same.

First claim

What is claimed is:

1 . A cathode for an all-solid-state battery, comprising:
a composite particle; and a sulfide-based solid electrolyte, wherein the composite particle comprises a core portion comprising a cathode active material and a shell portion coated onto the core portion, and the shell portion comprises a first material represented by Chemical Formula 1 and a second material represented by Chemical Formula 2:

Li

2
+
x

⁢

B
x

⁢

O
3

[

Chemical
⁢

Formula
⁢

1

]

wherein x is 0<x≤1; and

Li

2
+
y

⁢

P
y

⁢

O
4

[

Chemical
⁢

Formula
⁢

2

]

wherein y is 0<y≤1.

2 . The cathode of claim 1 , wherein the cathode active material comprises a compound represented by Chemical Formula 3:
[Chemical Formula 3] Li x M1 a M2 b M3 c O y wherein each of M1, M2, and M3 is independently selected from the group consisting of Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, and B, and 0<x≤1.1, 1.98≤y≤2.02, 0<a<1, 0<b<1, 0<c<1, and 0<a+b+c≤1.

3 . The cathode of claim 1 , wherein a thickness of the shell portion is about 0.5 nm to 50 nm.

4 . The cathode of claim 1 , wherein the shell portion comprises the first material and the second material in a mass ratio of about 1:0.25 to 1:4.

5 . The cathode of claim 1 , wherein the composite particle comprises an amount of about 97 wt % to 99.99 wt % of the core portion and an amount of about 0.01 wt % to 3 wt % of the shell portion, based on the total weight of the composite particle.

6 . The cathode of claim 1 , wherein the shell portion comprises a first shell disposed on the core portion and comprising the first material and a second shell disposed on the first shell and comprising the second material.

7 . The cathode of claim 6 , wherein the shell portion comprises the first shell and the second shell in a mass ratio of about 1:0.25 to 1:4.

8 . A method of manufacturing a cathode for an all-solid-state battery, comprising:
preparing a first solution comprising a lithium precursor, a boron precursor, and a phosphorus precursor; obtaining a second solution by adding a core portion comprising a cathode active material to the first solution; obtaining an intermediate in a powder form by drying the second solution; obtaining a composite particle by heat-treating the intermediate in an oxygen atmosphere; and manufacturing a cathode comprising the composite particle and a sulfide-based solid electrolyte, wherein the composite particle comprises the core portion and a shell portion coated onto the core portion, and the shell portion comprises a first material represented by Chemical Formula 1 and a second material represented by Chemical Formula 2:

Li

2
+
x

⁢

B
x

⁢

O
3

[

Chemical
⁢

Formula
⁢

1

]

wherein x is 0<x≤1; and

Li

2
+
y

⁢

P
y

⁢

O
4

[

Chemical
⁢

Formula
⁢

2

]

wherein y is O<y≤1.

9 . The method of claim 8 , wherein the lithium precursor comprises lithium ethoxide.

10 . The method of claim 8 , wherein the boron precursor comprises boric acid.

11 . The method of claim 8 , wherein the phosphorus precursor comprises polyphosphoric acid.

12 . The method of claim 8 , wherein the cathode active material comprises a compound represented by Chemical Formula 3:
[Chemical Formula 3] Li x M1 a M2 b ,M3 c O y wherein each of M1, M2, and M3 is independently selected from the group consisting of Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, and B; and 0<x≤1.1, 1.98≤y≤2.02, 0<a<1, 0<b<1, 0<c<1, and 0<a+b+c≤1.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Univ Kyonggi Ind & Acad Coop Found

Inventors

• Seo Jeong Hyun
• Min Hong Seok
• Noh Sung Woo
• Park Je Sik
• Seo Im Sul
• Seong Ju Yeong
• Lim Chung Bum
• Park Yong Joon
• Ji Yong Jun
• Lee Joo Young
• Joo Myeong Jun

Classifications

• H01M4/505

  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

• H01M4/131 Primary

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

• B60L50/60

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title