Positive Electrode Active Material and Lithium Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2025087670-A1
Application number	US-202418821222-A
Country	US
Kind code	A1
Filing date	Aug 30, 2024
Priority date	Sep 7, 2023
Publication date	Mar 13, 2025
Grant date	—

Abstract

The positive electrode active material includes: a first phase containing a lithium manganese oxide with a rock salt structure; and a second phase containing a lithium metal oxide with a layered structure, in a mixed state. In the positive electrode active material, the content of manganese may account for about 50 mol % or more of the total content of metals contained in the positive electrode active material, excluding lithium, and niobium (Nb) which is additionally doped on the positive electrode active material may be further included in an amount of about 2,000 ppm to 9,500 ppm based on the total content of the positive electrode active material.

First claim

What is claimed is:

1 . A positive electrode active material comprising:
a first phase containing a lithium manganese oxide with a rock salt structure; and a second phase containing a lithium metal oxide of Formula 1 with a layered structure, in a mixed state, wherein in the positive electrode active material, the content of manganese accounts for about 50 mol % or more of a total content of metals contained in the positive electrode active material, excluding lithium, and niobium (Nb) which is additionally doped on the positive electrode active material is further included in an amount of 2,000 ppm to 9,500 ppm based on a total content of the positive electrode active material:
Li[Ni 1-b-c Mn b M c ]O 2   [Formula 1]

wherein b is 0.4 or more and less than 1, c is 0 to 0.2, and M is at least one selected from the group consisting of Al, B, W, Mg, V, Ti, Zn, Ga, In, Ru, Sn, Sr and Zr.

2 . The positive electrode active material according to claim 1 , wherein the first phase contains a lithium manganese oxide represented by Li 2 MnO 3 .

3 . The positive electrode active material according to claim 1 , wherein the first phase and the second phase are included at a molar ratio of 1:9 to 5:5.

4 . The positive electrode active material according to claim 1 , wherein a ratio of total moles of lithium contained in the positive electrode active material is greater than 1 and 1.5 or less based on total moles of nickel (Ni), manganese (Mn) and metal M contained in the positive electrode active material.

5 . The positive electrode active material according to claim 1 , wherein a total molar ratio of nickel (Ni):manganese (Mn) contained in the positive electrode active material is 1:1 to 1:5.

6 . The positive electrode active material according to claim 1 , further comprising a lithium metal oxide composite of Formula 2 below,
wherein the niobium (Nb) is contained in an amount of 3,500 ppm to 8,000 ppm based on the total content of the positive electrode active material:
X{Li 2 MnO 3 }·(1−X){Li[Ni 1-b-c Mn b M c ]O 2 }  [Formula 2]

wherein X is 0.1 to 0.5, b is 0.45 to 0.95, c is 0 to 0.2, and M is at least one selected from the group consisting of Al, B, W, Mg, V, Ti, Zn, Ga, In, Ru, Sn, Sr and Zr.

7 . A positive electrode for a lithium secondary battery, the positive electrode comprising:
a positive electrode current collector; and a positive electrode active material layer formed on the positive electrode current collector and containing the positive electrode active material according to claim 1 , a binder and a conductive material.

8 . A lithium secondary battery comprising the positive electrode according to claim 7 , a negative electrode, and an electrolyte.

9 . The lithium secondary battery according to claim 8 , wherein a gas generation amount is about 2.9 mL or less after storage for two weeks under conditions of SOC (State of Charge) 100% and 60° C.

10 . A positive electrode active material comprising:
a first phase containing a lithium manganese oxide with a rock salt structure; and a second phase containing a lithium metal oxide of Formula 1 with a layered structure, in a mixed state, wherein in the positive electrode active material, the content of manganese accounts for about 50 mol % or more of a total content of metals contained in the positive electrode active material, excluding lithium, and niobium (Nb) which is additionally doped on the positive electrode active material is further included in an amount of 4,500 ppm to 5,500 ppm based on a total content of the positive electrode active material:
Li[Ni 1-b-c Mn b M c ]O 2   [Formula 1]

wherein b is 0.4 or more and less than 1, c is 0 to 0.2, and M is at least one selected from the group consisting of Al, B, W, Mg, V, Ti, Zn, Ga, In, Ru, Sn, Sr and Zr.

11 . The positive electrode active material according to claim 10 , wherein the first phase contains a lithium manganese oxide represented by Li 2 MnO 3 .

12 . A positive electrode for a lithium secondary battery, the positive electrode comprising:
a positive electrode current collector; and a positive electrode active material layer formed on the positive electrode current collector and containing the positive electrode active material according to claim 10 , a binder, and a conductive material.

13 . A lithium secondary battery comprising the positive electrode according to claim 12 , a negative electrode, and an electrolyte.

14 . The lithium secondary battery according to claim 13 , wherein a gas generation amount is about 2.9 mL or less after storage for two weeks under conditions of SOC (State of Charge) 100% and 60° C.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Youshin
• Park Kang Joon
• Lee Jaeyoung
• Kim Minjeong
• Park Sin Young
• Han Gi Beom

Classifications

• 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

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title