Positive electrode material for secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-12597605-B2
Application number	US-202017640616-A
Country	US
Kind code	B2
Filing date	Sep 11, 2020
Priority date	Sep 11, 2019
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

The present invention relates to a positive electrode material for a secondary battery, the positive electrode material including a first positive electrode active material and a second positive electrode active material, the first positive electrode active material and the second positive electrode active material being single particle types and lithium composite transition metal oxides including nickel, cobalt, and manganese and having a nickel content accounting for 60 mol % or more of total metals except for lithium, wherein the first positive electrode active material has a mean particle diameter (D 50 ) of 3 μm or less and a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.10 to 1.20, and the second positive electrode active material has a mean particle diameter (D 50 ) of greater than 3 μm and a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.00 to 1.13.

First claim

The invention claimed is:

1 . A positive electrode material for a secondary battery, the positive electrode material comprising a first positive electrode active material and a second positive electrode active material, the first positive electrode active material and the second positive electrode active material being single-particle-types and lithium composite transition metal oxides comprising nickel, cobalt, and manganese and having a nickel content accounting for 60 mol % or more of total metals except for lithium,
wherein the first positive electrode active material has a mean particle diameter (D 50 ) of 3 μm or less and a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.10 to 1.20, wherein the second positive electrode active material has a mean particle diameter (D 50 ) of greater than 3 μm and a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.00 to 1.13, and wherein a single-particle-type positive electrode material consists of one primary particle or an agglomeration of ten or less primary particles.

2 . The positive electrode material of claim 1 , wherein the molar ratio (Li/M) of lithium to the metals (M) except for lithium of the first positive electrode active material is greater than the molar ratio (Li/M) of lithium to the metals (M) except for lithium of the second positive electrode active material.

3 . The positive electrode material of claim 1 , wherein the first positive electrode active material has a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.13 to 1.17.

4 . The positive electrode material of claim 1 , wherein the second positive electrode active material has a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.03 to 1.10.

5 . The positive electrode material of claim 1 , wherein the first positive electrode active material has a mean particle diameter (D 50 ) of 1 μm to 3 μm.

6 . The positive electrode material of claim 1 , wherein the second positive electrode active material has a mean particle diameter (D 50 ) of 3.5 μm to 10 μm.

7 . The positive electrode material of claim 1 , wherein a cation mixing ratio of nickel cations in a lithium layer in a structure of the lithium composite transition metal oxide is 1.5% or less.

8 . The positive electrode material of claim 7 , wherein the cation mixing ratio of nickel cations in a lithium layer in a structure of the lithium composite transition metal oxide is 1.0% or less.

9 . The positive electrode material of claim 1 , wherein the positive electrode material comprising the first and second positive electrode active materials is a single particle type having a mean particle diameter (D 50 ) of 1 μm to 10 μm.

10 . The positive electrode material of claim 1 , wherein the first positive electrode active material and the second positive electrode active material are mixed in a weight ratio of 30:70 to 5:95.

11 . The positive electrode material of claim 1 , wherein the lithium composite transition metal oxide is represented by Formula 1 below:
Li a Ni 1−b−c−d Co b Mn c Q d O 2+δ   [Formula 1]
wherein, in Formula 1, Q is any one or more elements selected from the group consisting of Al, Mg, V, Ti, and Zr, 1.0≤a≤1.5, 0<b≤0.5, 0<c≤0.5, 0≤d≤0.1, 0<b+c+d≤0.4, and −0.1≤δ≤1.0.

12 . A positive electrode for a secondary battery, the positive electrode comprising the positive electrode material according to claim 1 .

13 . A lithium secondary battery comprising the positive electrode according to claim 12 .

14 . The positive electrode material of claim 1 , wherein the nickel content accounts from 60 mol % to 99 mol % of the total metals except for lithium.

15 . The positive electrode material of claim 1 , wherein the nickel content accounts from 70 mol % to 99 mol % of the total metals except for lithium.

16 . The positive electrode material of claim 1 , wherein the nickel content accounts from 80 mol % to 99 mol % of the total metals except for lithium.

17 . The positive electrode material of claim 1 , wherein the second positive electrode active material has a mean particle diameter (D 50 ) from 3 μm to 10 μm.

18 . The positive electrode material of claim 1 , wherein a cation mixing ratio is from 0.1% to 1.5%.

19 . A positive electrode material for a secondary battery, the positive electrode material comprising a first positive electrode active material and a second positive electrode active material, the first positive electrode active material and the second positive electrode active material being single-particle-types and lithium composite transition metal oxides comprising nickel, cobalt, and manganese and having a nickel content accounting for 60 mol % or more of total metals except for lithium,
wherein the first positive electrode active material has a mean particle diameter (D 50 ) of 3 μm or less and a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.10 to 1.20, wherein the second positive electrode active material has a mean particle diameter (D 50 ) of greater than 3 μm and a molar ratio (Li/M) of lithium to the metals (M) except for lithium of 1.00 to 1.13, wherein the molar ratio (Li/M) of the first positive electrode active material is different than the molar ratio (Li/M) of the second positive electrode active material, and wherein a single-particle-type positive electrode material consists of one primary particle or an agglomeration of ten or less primary particles.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lho Eun Sol
• Park Sang Min
• Park Sung Bin
• Kim Seul Ki
• Wang Wen Xiu
• Jung Wang Mo

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

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

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title