Cathode active material including lithium composite oxide having a layered crystal structure

Patent metadata

Field	Value
Publication number	US-11545657-B2
Application number	US-202016820643-A
Country	US
Kind code	B2
Filing date	Mar 16, 2020
Priority date	Jun 5, 2019
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A cathode active material includes a lithium composite oxide having a crystal structure which belongs to a layered structure. The lithium composite oxide has a BET specific surface area of not less than 5 m 2 /g and not more than 10 m 2 /g. The lithium composite oxide has an average particle size of not less than 3 μm and not more than 30 μm. The lithium composite oxide, an average crystallite size calculated by an X-ray diffraction method is not less than 150 Å and not more than 350 Å.

First claim

The invention claimed is:

1. A cathode active material comprising:
a lithium composite oxide having a crystal structure which belongs to a layered structure, wherein:
the lithium composite oxide has a BET specific surface area of not less than 5 m 2 /g and not more than 10 m 2 /g,
the lithium composite oxide has an average particle size of not less than 3 μm and not more than 30 μm,
in the lithium composite oxide, an average crystallite size calculated by an X-ray diffraction method is not less than 150 Å and not more than 350 Å, and
the lithium composite oxide includes at least one selected from the group consisting of F, Cl, N, and S.

2. The cathode active material according to claim 1 , wherein
the lithium composite oxide has an average particle size of not less than 10 μm and not more than 30 μm.

3. The cathode active material according to claim 1 , wherein
the lithium composite oxide has a BET specific surface area of not less than 7.5 m 2 /g and not more than 8.1 m 2 /g.

4. The cathode active material according to claim 1 , wherein
the lithium composite oxide includes Mn.

5. The cathode active material according to claim 1 , wherein
the lithium composite oxide includes F.

6. The cathode active material according to claim 1 , wherein
an average composition of the lithium composite oxide is represented by the following composition formula (1):
Li x Me y O α Q β   Formula (1)

where,
Me is at least one 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 selected from the group consisting of F, Cl, N, and S; and
the composition formula (1) satisfies the following conditions:
1.05≤x≤1.5;
0.6≤y≤1.0;
1.2≤α≤2.0; and
0<β≤0.8.

7. The cathode active material according to claim 6 , wherein
Me includes at least one selected from the group consisting of Mn, Co, Ni, Fe, Cu, V, Ti, Cr, and Zn.

8. The cathode active material according to claim 7 , wherein
Me includes at least one selected from the group consisting of Mn, Co, Ni, and Al.

9. The cathode active material according to claim 8 , wherein
Me includes Mn.

10. The cathode active material according to claim 9 , wherein
a ratio of Mn to Me is not less than 59.9 mol %.

11. The cathode active material according to claim 6 , wherein
Q includes F.

12. The cathode active material according to claim 1 , wherein
the cathode active material includes the lithium composite oxide as a main component.

13. The cathode active material according to claim 1 , wherein
the lithium composite oxide is a multi-phase mixture including a first phase having a crystal structure which belongs to a space group C2/m and a second phase having a crystal structure which belongs to a space group R-3m.

14. The cathode active material according to claim 13 , wherein
the lithium composite oxide is a two-phase mixture of the first phase and the second phase.

15. A battery, comprising:
a cathode including a cathode active material according to claim 1 ;
an anode; and
an electrolyte.

16. The battery according to claim 15 , wherein
the anode includes at least one selected from the group consisting of (i) an anode active material capable of occluding and releasing lithium ions and (ii) a material from which a metal lithium is dissolved into the electrolyte during discharge and onto which the metal lithium is deposited during charge; and
the electrolyte is a non-aqueous electrolyte liquid.

17. The battery according to claim 15 , wherein
the anode includes at least one selected from the group consisting of (i) an anode active material capable of occluding and releasing lithium ions and (ii) a material from which a metal lithium is dissolved into the electrolyte during discharge and onto which the metal lithium is deposited during charge; and
the electrolyte is a solid electrolyte.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• OMAE Takanori
• Natsui Ryuichi
• Otsuka yu
• Uchida Shuhei

Classifications

• H01M4/131 Primary

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

• H01M10/0525

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

• H01M4/1315

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

• H01M10/0562

  Solid materials · CPC title

• H01M10/052

  Li-accumulators · CPC title