Positive electrode active material containing lithium composite oxide and covering material, and battery including positive electrode active material

Patent metadata

Field	Value
Publication number	US-11201319-B2
Application number	US-201816034424-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Jul 27, 2017
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A positive electrode active material contains a lithium composite oxide and a covering material. The lithium composite oxide has a crystal structure that belongs to space group Fd-3m. The ration I (111) /I (400) of a first integrated intensity I (111) of a first peak corresponding to a (111) plane to a second integrated intensity I (400) of a second peak corresponding to a (400) plane in an XRD pattern of the lithium composite oxide satisfies 0.05≤I (111) /I (400) ≤0.90. The covering material has an electron conductivity of 10 6 S/m or less.

First claim

What is claimed is:

1. A positive electrode active material comprising:
a lithium composite oxide; and
a covering material that covers a surface of the lithium composite oxide,
wherein the lithium composite oxide is represented by a formula Li x Me y O α Q β ,
where Me is at least one element selected from the group consisting of Mn, Co, Ni, Fe, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, W, B, Si, P, and Al, Q is at least one element selected from the group consisting of F, Cl, N, and S, 1.05≤x≤1.4, 0.6≤y≤0.95, 1.33≤α≤2, and 0<β≤0.67, and 5≤α/β≤19,
the lithium composite oxide has a crystal structure that belongs to space group Fd-3m, and
a ratio I (111) /I (400) of a first integrated intensity I (111) of a first peak corresponding to a (111) plane to a second integrated intensity I (400) of a second peak corresponding to a (400) plane in an XRD pattern of the lithium composite oxide satisfies 0.05≤I (111) /I (400) ≤0.90.

2. The positive electrode active material according to claim 1 ,
wherein the covering material is an inorganic compound.

3. The positive electrode active material according to claim 1 ,
wherein a mass ratio of the covering material to the lithium composite oxide is 0.01 or more and 0.2 or less.

4. The positive electrode active material according to claim 3 ,
wherein the mass ratio of the covering material to the lithium composite oxide is 0.01 or more and 0.1 or less.

5. The positive electrode active material according to claim 1 ,
wherein the covering material has a thickness of 0.1 nm or more and 2.0 nm or less.

6. The positive electrode active material according to claim 1 ,
wherein the covering material forms a solid solution with at least a part of the surface of the lithium composite oxide.

7. The positive electrode active material according to claim 1 ,
wherein the covering material is an oxide.

8. The positive electrode active material according to claim 7 ,
wherein the oxide of the covering material is represented by a formula Li a A b O c ,
where A is at least one element selected from the group consisting of Mn, Co, Ni, Fe, Cu, Nb, Mo, Ti, Al, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, B, P, Eu, Sm, Ce, and H; and 0≤a≤3, 0.5≤b≤4, and 1≤c≤4.

9. The positive electrode active material according to claim 7 ,
wherein the oxide of the covering material is at least one oxide selected from the group consisting of Al 2 O 3 , ZrO 2 , ZnO, and TiO 2 .

10. The positive electrode active material according to claim 1 ,
wherein 0.05≤I (111) /I (400) ≤0.70.

11. The positive electrode active material according to claim 10 ,
wherein 0.05≤I (111) /I (400) ≤0.30.

12. The positive electrode active material according to claim 1 ,
wherein the lithium composite oxide contains manganese.

13. The positive electrode active material according to claim 1 ,
wherein the lithium composite oxide contains fluorine.

14. A battery comprising:
a positive electrode containing the positive electrode active material according to claim 1 ;
a negative electrode; and
an electrolyte.

15. The battery according to claim 14 ,
wherein the negative electrode contains:
a negative electrode active material that allows a lithium ion to be inserted therein and released therefrom; or
a material that allows lithium metal to be dissolved and deposited thereon, and the electrolyte is a nonaqueous electrolytic solution.

16. The battery according to claim 14 ,
wherein the negative electrode contains:
a negative electrode active material that allows a lithium ion to be inserted therein and released therefrom; or
a material that allows lithium metal to be dissolved and deposited thereon, and the electrolyte is a solid electrolyte.

17. The positive electrode active material according to claim 1 ,
wherein 1.3≤x/y≤1.9.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ishikawa Takayuki
• Natsui Ryuichi
• Nakura Kensuke

Classifications

• H01M4/505

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

• H01M4/13915

  containing halogen atoms, e.g. LiCoOxFy · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M2300/0068

  inorganic · CPC title