Sacrificial Positive Electrode Material with Reduced Gas Generation and Method of Preparing Thereof

Patent metadata

Field	Value
Publication number	US-2026051513-A1
Application number	US-202519369713-A
Country	US
Kind code	A1
Filing date	Oct 27, 2025
Priority date	Feb 23, 2021
Publication date	Feb 19, 2026
Grant date	—

Abstract

A disclosure sacrificial positive electrode material with reduced gas generation and a method of preparing the same are disclosed herein. In some embodiments, a method includes calcining a mixture of lithium oxide (Li2O) and cobalt oxide (CoO) in an atmosphere containing an inert gas and oxygen gas and having a relative humidity of 20% or less, wherein the oxygen gas is at a partial pressure of 1% or less, to prepare a lithium cobalt metal oxide represented by Chemical Formula (1):Lix⁢Co(1-y)⁢My⁢O4-z⁢Az[Chemical⁢Formula⁢1]M is at least one selected from the group consisting of Ti, Al, Zn, Zr, Mn and Ni, A is a halogen, x, y and z are 5≤x≤7, 0≤y≤0.4, and 0≤z≤0.001. A battery having the sacrificial positive electrode material can have reduced gas generation in the electrode assembly at the time of charging the battery, and thus the stability and life of the battery are improved.

First claim

1 . A positive electrode comprising:
a positive electrode current collector; and a positive electrode mixture layer containing a positive electrode active material, a conductive material, an organic binder polymer, and a sacrificial positive electrode material on the positive electrode current collector; the sacrificial positive electrode material comprises lithium cobalt metal oxide represented by Chemical Formula 1 below, and satisfies one or more of Equations 1 and 2, as measured by X-ray diffraction:

wherein,
M is at least one selected from the group consisting of Ti, Al, Zn, Zr, Mn and Ni,
A is a halogen,
x, y and z are 5≤x≤7, 0≤y≤0.4, and 0≤z≤0.001,

A
/
B

≤
0.1

[

Equation
⁢

1

]

C
/
D

≤
0.35

[

Equation
⁢

2

]

wherein,
A represents the intensity of the strongest peak among the peaks appearing in the range of 2θ=18.9±0.1°,
B represents the intensity of the strongest peak among the peaks appearing in the range of 2θ=19.2±0.1°,
C represents the intensity of the strongest peak among the peaks appearing in the range of 2θ=38.5±0.1°, and
D represents the intensity of the strongest peak among the peaks appearing in the range of 2θ=47.9±0.1°.

2 . The positive electrode of claim 1 , wherein the positive electrode active material is a lithium composite transition metal oxide containing two or more elements selected from the group consisting of nickel (Ni), cobalt (Co), manganese (Mn), aluminum (Al), zinc (Zn), titanium (Ti), magnesium (Mg), chromium (Cr) and zirconium (Zr).

3 . The positive electrode of claim 1 , wherein the content of the sacrificial positive electrode material is 0.001 to 5.0 parts by weight based on 100 parts by weight of the positive electrode active material.

4 . An electrode assembly comprising the positive electrode of claim 1 .

5 . A lithium secondary battery comprising the electrode assembly of claim 4 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Yoo Tae Gu
• Jung Wang Mo
• Jo Chi Ho
• Kim Ji Hye
• Jung Hae Jung
• Heo Jong Wook

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/0447

  of complete cells or cells stacks · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title