Cathode active material and battery

Patent metadata

Field	Value
Publication number	US-10230104-B2
Application number	US-201615160016-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	Jun 11, 2015
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

A cathode active material contains a compound represented by composition formula (1): LixNay{LiαNaβMn(1−α−β−z)Az}O2. In the formula, A represents at least one selected from the group consisting of Co, Ni, Fe, and Al, and the following conditions are met: 0.75≤x≤1.0, 0<y≤0.01, 0.75<x+y≤1, 0.16≤α≤0.3, 0<β≤0.01, 0.2≤α+β≤0.3, and 0≤z≤0.15.

First claim

What is claimed is:

1. A cathode active material comprising a compound represented by composition formula (1):
Li x Na y {Li α Na β Mn (1−α−β−z) A z }O 2   (1)

where A represents at least one selected from the group consisting of Co, Ni, Fe, and Al, and the following conditions are met:
0.75≤x≤1.0;
0<y≤0.01;
0.75<x+y≤1;
0.16≤α≤0.3;
0<β≤0.01;
0.2<α+β≤0.3; and
0≤z≤0.15.

2. The cathode active material according to claim 1 , wherein the compound has a crystal structure that belongs to space group C2/m.

3. The cathode active material according to claim 1 , wherein the compound is a main component of the cathode active material.

4. The cathode active material according to claim 1 , wherein 0.18≤α≤0.24.

5. The cathode active material according to claim 4 , wherein:
x=0.75; and
z=0.

6. The cathode active material according to claim 5 , wherein:
y=0.01; and
β3=0.01.

7. The cathode active material according to claim 4 , wherein:
A represents at least one selected from the group consisting of Co, Ni, and Fe;
0.75≤x≤0.8;
α=0.22; and
z=0.07.

8. The cathode active material according to claim 4 , wherein:
A represents at least one selected from the group consisting of Co, Ni, and Fe;
0.75×0.8;
α=0.22; and
z=0.15.

9. The cathode active material according to claim 1 , wherein 0≤z≤0.07.

10. A battery comprising:
a cathode containing a cathode active material;
an anode; and
an electrolyte; wherein
the cathode active material contains a compound represented by composition formula (1):
Li x Na y {Li α Na β Mn (1−α−β−z) A z }O 2   (1)

where A represents at least one selected from the group consisting of Co, Ni, Fe, and Al, and the following conditions are met:
0.75≤x≤1.0;
0<y≤0.01;
0.75<x+y≤1;
0.16≤α≤0.3;
0<β≤0.01;
0.2<α+β≤0.3; and
0≤z≤0.15.

11. The battery according to claim 10 , further comprising a nonaqueous solvent in which the electrolyte dissolves, wherein
the anode contains an anode active material that has a property of occluding and releasing lithium.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Natsui Ryuichi
• Nakura Kensuke

Classifications

• H01M2300/004

  Three solvents · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01G45/1285

  of the type (Mn2O5)n- · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · 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