Positive Electrode Active Material for Secondary Battery, Method for Preparing the Same and Lithium Secondary Battery Comprising the Same

Patent metadata

Field	Value
Publication number	US-2024313210-A1
Application number	US-202418677050-A
Country	US
Kind code	A1
Filing date	May 29, 2024
Priority date	Oct 26, 2018
Publication date	Sep 19, 2024
Grant date	—

Abstract

A positive electrode active material for a secondary battery is provided, which includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein a particle of the lithium composite transition metal oxide includes a core portion and a resistance portion formed on a surface of the core portion, and is composed of a single particle, wherein the core portion has a layered crystal structure of space group R-3m, and the resistance portion has a cubic rock-salt structure of space group Fm-3m.

First claim

1 . A positive electrode active material for a secondary battery, the positive electrode active material comprising a lithium composite transition metal oxide
wherein a particle of the lithium composite transition metal oxide comprises a core portion and a resistance portion formed on a surface of the core portion, and is composed of a single particle, wherein the core portion has a layered crystal structure of space group R-3m, and the resistance portion has a cubic rock-salt structure of space group Fm-3m and
wherein the core portion and resistance portion are the lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), and the lithium composite transition metal oxide in which an amount of the nickel (Ni) in a total amount of metals excluding lithium (Li) is 60 mol % or more.

2 . The positive electrode active material for a secondary battery of claim 1 , wherein the resistance portion is formed on a part or entirety of the surface of the core portion.

3 . The positive electrode active material for a secondary battery of claim 1 , wherein the core portion has a crystallite size of 180 nm to 400 nm.

4 . The positive electrode active material for a secondary battery of claim 1 , wherein a main peak with a maximum heat flow is measured at 210° C. or more, and the maximum heat flow is 15 W/g or less when the positive electrode active material is thermally by differential scanning analyzed calorimetry (DSC).

5 . The positive electrode active material for a secondary battery of claim 1 , wherein a main peak with a maximum heat flow is measured at 210° C. to 250° C., and the maximum heat flow is 15 W/g or less when the positive electrode active material is thermally analyzed by differential scanning calorimetry (DSC).

6 . The positive electrode active material for a secondary battery of claim 1 , wherein the lithium composite transition metal oxide particle is composed of a primary particle having an average particle diameter (D 50 ) of 3 μm to 10 μm.

7 . A positive electrode for a secondary battery, the positive electrode comprising the positive electrode active material of claim 1 .

8 . A lithium secondary battery comprising the positive electrode of claim 7 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Han Gi Beom
• Park Sang Min
• Kim Ji Hye
• Yoo Tae Gu
• Jung Wang Mo

Classifications

• H01M4/366

  as layered products · CPC title

• H01M4/0471 Primary

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

• H01M2004/028

  Positive electrodes · 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

• H01M10/0525

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