Positive electrode active material with controlled specific surface area, method of preparing same, and positive electrode containing same

Patent metadata

Field	Value
Publication number	US-2025223189-A1
Application number	US-202418806315-A
Country	US
Kind code	A1
Filing date	Aug 15, 2024
Priority date	Jan 8, 2024
Publication date	Jul 10, 2025
Grant date	—

Abstract

A positive electrode active material with a controlled specific surface area, a method of preparing the same, and a positive electrode containing the same, can have a density of the positive electrode active material being optimized by controlling the sintering conditions and composition of the positive electrode active material, thus maximizing the output characteristics of an all-solid-state battery containing the same. The positive electrode active material can include a lithium composite oxide enabling intercalation or deintercalation of lithium, wherein in the lithium composite oxide, a ratio (Sm/Sc) of a measured specific surface area (Sm) based on a Brunauer-Emmett-Teller (BET) method to a calculated specific surface area (Sc) based on a particle size distribution (PSD) analysis result is in a first range of 2.0 to 3.3.

First claim

What is claimed is:

1 . A positive electrode active material for an all-solid-state battery, the positive electrode active material comprising a lithium composite oxide enabling intercalation or deintercalation of lithium, wherein in the lithium composite oxide, a ratio (S m /S c ) of a measured specific surface area (S m ) based on a Brunauer-Emmett-Teller (BET) method to a calculated specific surface area (S c ) based on a particle size distribution (PSD) analysis result is in a first range of 2.0 to 3.3.

2 . The positive electrode active material of claim 1 , wherein the calculated specific surface area (S c ) satisfies

Sc
⁡
(

m
2

g

)

=

∑

d
=
1

∞

⁢

(

(

〚

(

Size
d

)

⁢

1
2

)

〛

2

×
%
⁢

Chan
d

)

×
4

∑

d
=
1

∞

⁢

(

4

3
⁢

(

(

Size
d

)

⁢

1
2

)

3

×
%
⁢

Chan
d

)

×
4.77

wherein d represents the positive electrode active material, wherein Size d is a particle diameter of the positive electrode active material, and wherein % Chan d is a ratio of the positive electrode active material having the particle diameter Size d to an entire positive electrode active material expressed in percentage.

3 . The positive electrode active material of claim 1 , wherein the lithium composite oxide is represented by LiNi 1-x-y Co x Mn y M 1 z O 2 , wherein x, y, and z satisfy 0<x<0.4, 0<y<0.4, 0≤z<0.4, and 0<x+y+z≤0.4, and wherein M 1 comprises at least one element selected from the group consisting of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, and Cr.

4 . The positive electrode active material of claim 1 , wherein the ratio (S m /S c ) is in a second range of 2.59 to 3.05.

5 . A positive electrode active material layer comprising:
a positive electrode active material comprising a lithium composite oxide enabling intercalation or deintercalation of lithium, wherein in the lithium composite oxide, a ratio (S m /S c ) of a measured specific surface area (S m ) based on a Brunauer-Emmett-Teller (BET) method to a calculated specific surface area (S c ) based on a particle size distribution (PSD) analysis result is in a first range of 2.0 to 3.3; and a sulfide-based solid electrolyte.

6 . The layer of claim 5 , wherein the calculated specific surface area (S c ) satisfies

Sc
⁡
(

m
2

g

)

=

∑

d
=
1

∞

⁢

(

(

〚

(

Size
d

)

⁢

1
2

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

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

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• C01G51/44

  containing manganese · CPC title

• C01G53/44

  containing manganese · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/525 Primary

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