Positive electrode material for lithium secondary battery, positive electrode including same, and lithium secondary battery

Patent metadata

Field	Value
Publication number	US-11799081-B2
Application number	US-201816763341-A
Country	US
Kind code	B2
Filing date	Nov 21, 2018
Priority date	Nov 21, 2017
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A positive electrode material including a first positive electrode active material represented by Formula 1 and a second positive electrode active material represented by Formula 2, a positive electrode including the same, and a lithium secondary battery including the positive electrode are provided. The positive electrode material has a bimodal particle size distribution including large diameter particles and small diameter particles, and the difference in average particle diameter (D 50 ) between the large diameter particles and the small diameter particles is 3 μm or greater.

First claim

The invention claimed is:

1. A positive electrode material comprising a first positive electrode active material represented by Formula 1 below, and a second positive electrode active material represented by Formula 2 below, wherein
the positive electrode material has a bimodal particle size distribution including large diameter particles and small diameter particles, and
a difference an average particle diameter (D 50 ) between the large diameter particles and the small diameter particles is 3 μm or greater:
Li a [Ni b Co c M 1 d M a e ]O 2   [Formula 1]

wherein, in Formula 1, M 1 is Mn, Al, Zr, or Mg, and M a 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≤a≤1.2, 0.8≤b<1, 0.01≤c<0.2, 0.01≤d<0.2, and 0≤e≤0.02.
Li x [Ni y Co z Mn w M 2 v M b u ]O 2   [Formula 2]

wherein, in Formula 2, M 2 is Al, and M b 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, 0.8≤y<1, 0.01≤z<0.2, 0.01≤w<0.2, 0.01≤v<0.2, and 0≤u≤0.02,
wherein the first positive electrode active material is the large diameter particles, and the second positive electrode active material is the small diameter particles.

2. The positive electrode material of claim 1 , wherein an average particle diameter (D 50 ) of the large diameter particles is 10 μm to 20 μm.

3. The positive electrode material of claim 1 , wherein an average particle diameter (D 50 ) of the small diameter particles is 1 μm to 7 μm.

4. The positive electrode material of claim 1 , wherein the first positive electrode active material and the second positive electrode active material are present at a weight ratio of 10:90 to 90:10.

5. The positive electrode material of claim 1 , wherein at least one of the first positive electrode active material or the second positive electrode active material comprises a coating layer including at least one coating element selected from the group consisting of 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.

6. The positive electrode material of claim 1 , wherein the difference in average particle diameter (D 50 ) between the large diameter particles and the small diameter particles is 3 μm to 15 μm.

7. A positive electrode comprising a positive electrode current collector, and a positive electrode active material layer formed on the positive electrode current collector,
wherein the positive electrode active material layer comprises the positive electrode material of claim 1 .

8. A lithium secondary battery comprising:
the positive electrode of claim 7 ;
a negative electrode;
a separator interposed between the positive electrode and the negative electrode; and
an electrolyte.

9. The positive electrode material of claim 1 , wherein the difference in average particle diameter (D 50 ) between the large diameter particles and the small diameter particles is 3 μm to 10 μm.

10. The positive electrode material of claim 5 , wherein the coating element is included in the coating layer in a content of 100 ppm to 10,000 ppm based on a total weight of the positive electrode material.

11. The positive electrode material of claim 8 , wherein the coating layer is formed on an entire surface of the at least one of the first positive electrode active material or the second positive electrode active material.

12. The positive electrode material of claim 8 , wherein the c oating layer is formed in an area of 5% to less than 100% of a total surface area of the positive electrode material.

13. A positive electrode material comprising a first positive electrode active material represented by Formula 1 below, and a second positive electrode active material represented by Formula 2 below, wherein
the positive electrode material has a bimodal particle size distribution including large diameter particles and small diameter particles, and
a difference in average particle diameter (D 50 ) between the large diameter particles and the small diameter particles is 3 μm to 15 μm:
Li a [Ni b Co c M 1 d M a e ]O 2   [Formula 1]

wherein, in Formula 1, M 1 is Mn, and Ma is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and 0.9≤a≤1.2, 0.8≤b<1, 0.01≤c<0.2, 0.01≤d<0.2, and 0≤e≤0.02.
Li x [Ni y Co z Mn w M 2 v M b u ]O 2   [Formula 2]

wherein, in Formula 2 , M 2 is Al, and M b is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and 0.9≤x≤1.2, 0.8≤y<1, 0.01≤z<0.2, 0.01≤w<0.2, 0.01≤v<0.2, and 0≤u<0.02,
wherein the first positive electrode active material is the large diameter particles, and the second positive electrode active material is the small diameter particles,
wherein an average particle diameter (D 50 ) of the large diameter particles is 10 μm to 20 μm, and an average particle diameter (D 50 ) of the small diameter particles is 1 μm to 7 μm.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Lee Dong Hun
• Jung Wang Mo
• Park Sung Bin
• Kim Ji Hye
• Kim Dong Hwi
• Cho Hyung Man
• Han Jung Min

Classifications

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/505

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

• H01M4/66

  Selection of materials · CPC title

• H01M10/0525

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