Sacrificial positive electrode material with reduced gas generation and method of preparing thereof

Patent metadata

Field	Value
Publication number	US-12469853-B2
Application number	US-202217915607-A
Country	US
Kind code	B2
Filing date	Feb 9, 2022
Priority date	Feb 23, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

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 (Li 2 O) 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):

Li x Co (1−y) M y O 4−z A z   [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

The invention claimed is:

1 . A method of preparing a sacrificial positive electrode material, comprising:
calcining a raw material mixture of lithium oxide (Li 2 O) and cobalt oxide (CoO) under atmosphere containing an inert gas and oxygen gas, wherein the oxygen gas is at a partial pressure of 1% or less to prepare a lithium cobalt metal oxide represented by the following Chemical Formula (1), wherein the atmosphere has a relative humidity (RH) of 0.1% to 15%:
Li x Co (1−y) M y O 4−z A z   [Chemical Formula 1]

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

2 . The method of claim 1 , wherein the calcining is performed at a temperature of 500 to 800° C.

3 . The method according to claim 1 , wherein the lithium oxide (Li 2 O) and the cobalt oxide (CoO) are in a molar ratio of 2 to 4:1.

4 . The method of claim 1 , wherein the average particle size (D 50 ) of lithium oxide (Li 2 O) is in a range of 10 μm to 30 μm.

5 . The method of claim 1 , wherein the sacrificial positive electrode material satisfies one or more of Equations 1 and 2 below, as measured by X-ray diffraction:
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°.

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