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

Patent metadata

Field	Value
Publication number	US-10833322-B2
Application number	US-201715844626-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Jan 19, 2017
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A positive electrode active material contains a lithium composite oxide and a lithium composite oxyfluoride. The lithium composite oxyfluoride covers at least part of the surface of the lithium composite oxide. The lithium composite oxyfluoride is represented by a composition formula Li α Me2 β O γ F δ , where Me2 represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ru, and W; and 1.0≤α≤2.1; 0.8≤β≤1.3; 1.5≤γ≤2.9; and 0.1≤δ≤1.5. The crystal structure of the lithium composite oxyfluoride belongs to space group Fm-3 m.

First claim

What is claimed is:

1. A positive electrode active material comprising:
a lithium composite oxide; and
a lithium composite oxyfluoride covering at least part of the lithium composite oxide, wherein
the lithium composite oxyfluoride is represented by a composition formula Li α Me2 β O γ F δ , where Me2 represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ru, and W; 1.0≤α≤2.1; 0.8≤β≤1.3; 1.5≤γ≤2.9; and 0.1≤δ≤1.5, and
a crystal structure of the lithium composite oxyfluoride belongs to space group FM-3M,
wherein a mass ratio of the lithium composite oxyfluoride to the lithium composite oxide is 0.001 or more and 0.1 or less.

2. The positive electrode active material according to claim 1 ,
wherein the mass ratio is 0.01 or more and 0.05 or less.

3. The positive electrode active material according to claim 1 ,
wherein the lithium composite oxide is represented by a composition formula Li x Me1 y A z O 2 , where Me1 represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ru, and W; A represents at least one selected from the group consisting of B, P, Si, S, and N; 0.5≤x≤1.34; 0.5≤y≤1.0; 0≤z≤0.5; and 1.5≤x+y+z≥2.0.

4. The positive electrode active material according to claim 1 ,
wherein 1.0≤α≤2.0, β=1.0, 1.5≤γ≤2.0, and 0.5≤δ≤1.0.

5. The positive electrode active material according to claim 1 ,
wherein Me2 includes at least one selected from the group consisting of Mn, Co, Ni, Fe, Cu, V, Ti, Cr, and Zn as an essential component.

6. The positive electrode active material according to claim 1 ,
wherein Me2 includes at least one selected from the group consisting of Mn and Ni as an essential component.

7. The positive electrode active material according to claim 1 ,
wherein the mass proportion of the lithium composite oxide in the positive electrode active material is 50% or more.

8. The positive electrode active material according to claim 1 ,
wherein the positive electrode active material is a mixture of a plurality of first particles containing the lithium composite oxide and a plurality of second particles containing the lithium composite oxyfluoride, and
at least one of the plurality of first particles is in direct contact with at least one of the plurality of second particles.

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

10. The battery according to claim 9 ,
wherein the positive electrode includes a positive electrode active material layer containing the positive electrode active material as a main component.

11. The battery according to claim 9 ,
wherein the negative electrode includes:
a negative electrode active material into and from which lithium ion is reversibly occluded and released; or
a material on which lithium metal is reversibly precipitated and dissolved, and the electrolyte is a nonaqueous electrolyte solution.

12. The battery according to claim 9 ,
wherein the negative electrode includes:
a negative electrode active material into and from which lithium ion is reversibly occluded and released; or
a material on which lithium metal is reversibly precipitated and dissolved, and the electrolyte is a solid electrolyte.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Natsui Ryuichi
• Nakura Kensuke

Classifications

• H01M2300/0065

  Solid electrolytes · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/525

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

• H01M10/0525

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

• H01M4/582 Primary

  Halogenides · CPC title