Positive electrode active material for lithium secondary battery and lithium secondary battery

Patent metadata

Field	Value
Publication number	US-12211997-B2
Application number	US-201915734352-A
Country	US
Kind code	B2
Filing date	Jun 19, 2019
Priority date	Jun 20, 2018
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Provided is a lithium secondary battery which includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode includes a lithium composite transition metal oxide powder having a layered structure and a nickel content accounting for 85 atm % or more of total transition metals, and wherein the lithium composite transition metal oxide powder undergoes a 3% or less change in lithium-oxygen (Li—O) interlayer spacing in a state-of-charge (SOC) range of 58% to 72%.

First claim

The invention claimed is:

1. A lithium secondary battery comprising:
a positive electrode;
a negative electrode;
a separator interposed between the positive electrode and the negative electrode; and
an electrolyte,
wherein the positive electrode includes a positive electrode active material of a lithium composite transition metal oxide powder having a layered structure and a nickel content accounting for 85 atm % or more of total transition metals,
wherein the lithium composite transition metal oxide powder undergoes a 3% or less change in lithium-oxygen (Li—O) interlayer spacing in a state-of-charge (SOC) range of 58% to 72%.

2. The lithium secondary battery of claim 1 , wherein the lithium composite transition metal oxide powder undergoes a 1% or less change in the Li—O interlayer spacing in the SOC range of 58% to 72%.

3. The lithium secondary battery of claim 1 , wherein, in the lithium composite transition metal oxide powder, a Li—O interlayer spacing at 100% SOC is greater than or equal to a Li—O interlayer spacing at 0% SOC.

4. The lithium secondary battery of claim 1 , wherein the lithium composite transition metal oxide is represented by Chemical Formula 1:
Li x [Ni a Co b Mn c M d ]O 2   [Chemical Formula 1]

wherein, in Chemical Formula 1,
M is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B and Mo, and 0.9≤x≤1.2, 0.85≤a≤0.99, 0<b<0.15, 0<c<0.15, and 0<d<0.15.

5. The lithium secondary battery of claim 4 , wherein the M includes two or more elements selected from the group consisting of W, Zr, Al, Ti and Mg.

6. The lithium secondary battery of claim 4 , wherein the M includes W and one or more elements selected from the group consisting of Zr, Al, Ti and Mg.

7. The lithium secondary battery of claim 1 , wherein the lithium composite transition metal oxide includes, on a surface thereof, a coating layer including one or more elements selected from the group consisting of Al, Ti, W, B, F, P, Mg, Ni, Co, Fe, Cr, V, Cu, Ca, Zn, Zr, Nb, Mo, Sr, Sb, Bi, Si and S.

8. A positive electrode active material for a lithium secondary battery, comprising: a lithium composite transition metal oxide powder having a layered structure and a nickel content accounting for 85 atm % or more of total transition metals,
wherein the lithium composite transition metal oxide powder undergoes a 3% or less change in Li—O interlayer spacing in a SOC range of 58% to 72%.

9. The positive electrode active material of claim 8 , wherein the lithium composite transition metal oxide powder undergoes a 1% or less change in the Li—O interlayer spacing in the SOC range of 58% to 72%.

10. The positive electrode active material of claim 8 , wherein, in the lithium composite transition metal oxide powder, a Li—O interlayer spacing at 100% SOC is greater than or equal to a Li—O interlayer spacing at 0% SOC.

11. The positive electrode active material of claim 8 , wherein the lithium composite transition metal oxide is represented by Chemical Formula 1:
Li x [Ni a Co b Mn c M d ]O 2   [Chemical Formula 1]

wherein, in Chemical Formula 1,
M is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B and Mo, and 0.95≤x≤1.2, 0.85≤a≤0.99, 0<b<0.15, 0<c<0.15, and 0<d<0.15.

12. The positive electrode active material of claim 11 , wherein the M includes two or more elements selected from the group consisting of W, Zr, Al, Ti and Mg.

13. The positive electrode active material of claim 11 , wherein the M includes W and one or more elements selected from the group consisting of Zr, Al, Ti and Mg.

14. The positive electrode active material of claim 8 , wherein the lithium composite transition metal oxide includes, on a surface thereof, a coating layer including one or more elements selected from the group consisting of Al, Ti, W, B, F, P, Mg, Ni, Co, Fe, Cr, V, Cu, Ca, Zn, Zr, Nb, Mo, Sr, Sb, Bi, Si and S.

Assignees

• Lg Chemical Ltd

Inventors

• Baek Hyeon Hui
• Ban Sung Ho
• Eom Jun Ho
• Lim Chae Jin
• Lee Sang Jo
• Park Na Ri

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M10/0525

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

• H01M4/505

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