Method for preparing positive electrode active material for secondary battery, positive electrode active material thus prepared and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11888153-B2
Application number	US-202117459344-A
Country	US
Kind code	B2
Filing date	Aug 27, 2021
Priority date	Sep 29, 2017
Publication date	Jan 30, 2024
Grant date	Jan 30, 2024

Abstract

A positive electrode active material, a positive electrode including the same, and a lithium secondary batter including the same are disclosed herein. In some embodiments, the positive electrode active material includes a lithium transition metal oxide, and a coating layer formed on a surface of the lithium transition metal oxide particle, wherein the coating layer is formed in a film form, and the coating layer includes a carbonized coating polymer and carbide.

First claim

The invention claimed is:

1. A positive electrode active material for a secondary battery, the positive electrode active material comprising:
a lithium transition metal oxide particle; and
a coating layer formed on a surface of the lithium transition metal oxide particle,
wherein the coating layer is formed in a film form,
wherein the coating layer has a thickness from 15-2,000 nm, and
the coating layer includes a carbonized coating polymer and carbide, wherein the lithium transition metal oxide particle has a layered structure or a spinel structure.

2. The positive electrode active material of claim 1 ,
wherein the coating polymer is at least one selected from the group consisting of polyvinylidene fluoride (PVDF), polyvinylpyrrolidone, polyethylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, an epoxy resin, an amino resin, a phenol resin, and a polyester resin.

3. The positive electrode active material of claim 1 ,
wherein the coating polymer is at least one selected from the group consisting of polyvinylidene fluoride (PVDF), polyvinylpyrrolidone, polyethylene terephthalate, and polyvinylidene chloride.

4. The positive electrode active material of claim 1 ,
wherein the carbide is at least one selected from the group consisting of B 4 C, Al 4 C 3 , TiC, TaC, WC, NbC, HfC, VC, and ZrC.

5. The positive electrode active material of claim 1 ,
wherein the carbide is B 4 C or Al 4 C 3 .

6. The positive electrode active material of claim 1 ,
wherein the carbide is present in an amount of 0.001 to 10 parts by weight with respect to 100 parts by weight of the lithium transition metal oxide particle.

7. A positive electrode for a secondary battery, the positive electrode comprising the positive electrode active material of claim 1 .

8. A lithium secondary battery comprising the positive electrode of claim 7 .

9. The positive electrode active material of claim 1 , wherein the lithium transition metal oxide particle comprises LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , or a lithium transition metal composite oxide represented by following formula 1:
Li p Ni 1-x-y Co x M a y M b z O 2   [formula 1]

where M a is at least one element selected from the group consisting of Mn, Al or Zr, M b is at least one element selected from the group consisting of Al, Zr, Ti, Mg, Ta, Nb, Mo, W or Cr, and 0.9≤p≤1.5, 0≤x≤0.5, 0≤y≤0.5 and 0≤z≤0.1 are satisfied.

10. The positive electrode active material of claim 1 , wherein the coating layer has the thickness from 1,000-2,000 nm.

11. The positive electrode active material of claim 1 , wherein the coating layer has a ratio of the carbonized coating polymer to the carbide in a range from 20:80 to 80:20.

Assignees

• Lg Chemical Ltd

Inventors

• Ahn Dong Joon
• Cho Moon Kyu
• Park Sung Soon

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/0525

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

• H01M2004/028

  Positive electrodes · CPC title