Positive Electrode Active Material and Positive Electrode Including the Same

Patent metadata

Field	Value
Publication number	US-2025046806-A1
Application number	US-202318718123-A
Country	US
Kind code	A1
Filing date	May 22, 2023
Priority date	May 20, 2022
Publication date	Feb 6, 2025
Grant date	—

Abstract

A positive electrode active material in a form of a single particle is configured so that after a positive electrode, which includes a positive electrode active material layer containing 80 wt % or more of the positive electrode active material based on a total weight of the positive electrode active material layer, is rolled, a density of the positive electrode active material layer after the rolling is 2.7 g/cm 3 or more. When the positive electrode active material layer is analyzed by XRD (X-ray diffraction), a ratio of an area of a (003) peak to an area of all peaks identified in a 2θ range of 10° to 90° satisfies 30% or more. Also provided is a positive electrode including the same. The positive electrode active material is capable of achieving a battery with improved initial resistance characteristics and life characteristics.

First claim

1 . A positive electrode active material in a form of a single particle,
wherein, the positive electrode active material is configured so that: after a positive electrode, which includes a positive electrode active material layer containing 80 wt % or more of the positive electrode active material based on a total weight of the positive electrode active material layer, is rolled, a density of the positive electrode active material layer after the rolling is 2.7 g/cm 3 or more, and when the positive electrode active material layer is analyzed by XRD (X-ray diffraction), a ratio of an area of a (003) peak to an area of all peaks identified in a 2θ range of 10° to 90° satisfies 30% or more.

2 . The positive electrode active material of claim 1 , wherein, the positive electrode active material is configured so that when the positive electrode active material layers before and after the rolling of the positive electrode are analyzed by XRD, a difference in the ratios of the area of the (003) peak to the area of the all peaks identified in a 2θ range of 10° to 90° satisfies 10% or more.

3 . The positive electrode active material of claim 1 , wherein the positive electrode active material in the form of the single particle has a ratio of a length in an a-axis direction to a length in a c-axis direction of greater than 1.

4 . The positive electrode active material of claim 1 , wherein the positive electrode active material in the form of the single particle is composed of 1 to 50 single crystal grains.

5 . The positive electrode active material of claim 4 , wherein the single crystal grain has an average grain diameter (D EBSD ) ranging from 0.1 μm to 10 μm.

6 . The positive electrode active material of claim 1 , wherein the positive electrode active material in the form of the single particle is a lithium composite transition metal oxide containing nickel (Ni), cobalt (Co), and manganese (Mn).

7 . The positive electrode active material of claim 6 , wherein the lithium composite transition metal oxide comprises 60 mol % or more of the nickel (Ni) among total metals excluding lithium.

8 . The positive electrode active material of claim 6 , wherein the lithium composite transition metal oxide has a composition represented by Formula 1:
Li a Ni b Co c Mn d M 1 e O 2   [Formula 1]
wherein M 1 includes at least one of aluminum (Al), zirconium (Zr), boron (B), tungsten (W), molybdenum (Mo), chromium (Cr), niobium (Nb), magnesium (Mg), hafnium (Hf), tantalum (Ta), lanthanum (La), titanium (Ti), strontium (Sr), barium (Ba), cerium (Ce), tin (Sn), yttrium (Y), zinc (Zn), fluorine (F), phosphorus (P), or sulfur (S), and 0.90≤a≤1.1, 0.60≤b<1.0, 0<c<0.40, 0<d<0.40, 0≤e≤0.10, and b+c+d+e=1.

9 . A positive electrode comprising:
a current collector; and a positive electrode active material layer disposed on the current collector, wherein the positive electrode active material layer comprises the positive electrode active material in the form of the single particle of claim 1 .

10 . The positive electrode of claim 9 , wherein, when the positive electrode active material layers before and after rolling of the positive electrode are analyzed by XRD (X-ray diffraction), a difference in ratios of an area of a (003) peak to an area of all peaks identified in a 2θ range of 10° to 90° is from 10% or more.

11 . The positive electrode of claim 9 , wherein, when an angle formed between a lithium movement path of the positive electrode active material in the form of the single particle and a parallel axis with respect to an upper surface of the current collector is θ, a value of (cos θ) 2 is 0.6 or more.

12 . The positive electrode of claim 9 , wherein the positive electrode active material in the form of the single particle has a c-axis direction of a crystal aligned in a direction perpendicular to an upper surface of the current collector.

13 . The positive electrode of claim 9 , wherein the positive electrode active material in the form of the single particle has a ratio of a length in an a-axis direction to a length in a c-axis direction of greater than 1.

14 . The positive electrode of claim 9 , wherein the positive electrode active material in the form of the single particle is composed of 1 to 50 single crystal grains.

15 . The positive electrode of claim 14 , wherein the single crystal grain has an average grain diameter (D EBSD ) ranging from 0.1 μm to 10 μm.

16 . The positive electrode of claim 9 , wherein the positive electrode active material in the form of the single particle is a lithium composite transition metal oxide containing nickel (Ni), cobalt (Co), and manganese (Mn).

17 . The positive electrode of claim 16 , wherein the lithium composite transition metal oxide comprises 60 mol % or more of the nickel (Ni) among total metals excluding lithium.

18 . The positive electrode of claim 16 , wherein the lithium composite transition metal oxide has a composition represented by Formula 1:
Li a Ni b Co c Mn d M 1 e O 2   [Formula 1]
wherein M 1 includes at least one of aluminum (Al), zirconium (Zr), boron (B), tungsten (W), molybdenum (Mo), chromium (Cr), niobium (Nb), magnesium (Mg), hafnium (Hf), tantalum (Ta), lanthanum (La), titanium (Ti), strontium (Sr), barium (Ba), cerium (Ce), tin (Sn), yttrium (Y), zinc (Zn), fluorine (F), phosphorus (P), or sulfur (S), and 0.90≤a≤1.1, 0.60≤b<1.0, 0<c<0.40, 0<d<0.40, 0≤e≤0.10, and b+c+d+e=1.

Assignees

• Lg Chemical Ltd

Inventors

• Jung Won Sig
• Kim Jong Pil
• Lee Eung Ju
• Rhee Tae Young
• Choi Hwan Young

Classifications

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C01P2006/10

  Solid density · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title