Cathode active material for nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery, and method of producing cathode active material for nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-9893356-B2
Application number	US-201514675871-A
Country	US
Kind code	B2
Filing date	Apr 1, 2015
Priority date	Apr 15, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

The cathode active material for a nonaqueous electrolyte secondary battery according to an aspect of the present disclosure mainly comprises a compound represented by a composition formula: Li x Na y (Li α Na β Mn 1−α−β )O 2 , where x, y, α, and β satisfy 0.75≦x≦1.0, 0<y≦0.01, 0.75<x+y≦1, 0.16≦α≦0.3, 0≦β≦0.01, and 0.2≦α+β≦0.3.

First claim

What is claimed is:

1. A cathode active material for a nonaqueous electrolyte secondary battery mainly comprising a compound represented by a composition formula:
Li x Na y (Li α Na β Mn 1−α−β )O 2 , where x, y, α, and β satisfy:
0. 75x<1.0;
0<y≦0.01;
0.75<x+y ≦1;
0.16≦α≦0.3;
0≦β≦0.01; and
0.17≦α+β≦0.3.

2. The cathode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
the compound has a crystal structure belonging to space group C2/m.

3. The cathode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein:
α satisfies: 0.19≦α≦0.3, and
α and β satisfy: 0.2≦α+β≦0.3.

4. The cathode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein:
α satisfies 0.16≦α<0.3, and
β satisfies: 0<β≦0.01.

5. A nonaqueous electrolyte secondary battery comprising:
a cathode containing the cathode active material according to claim 1 ;
an anode containing an anode active material;
a separator disposed between the cathode and the anode; and
a nonaqueous electrolytic solution.

6. The cathode active material for a nonaqueous electrolyte secondary battery according to claim 3 , wherein:
α satisfies 0.19≦α<0.3, and
β satisfies: 0<β≦0.01.

7. The cathode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein:
x satisfies 0.75≦x≦0.8, and
x and y satisfy 0.75<x+y≦0.81.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Natsui Ryuichi
• Nakura Kensuke

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• C01G45/1221

  Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title