Positive electrode active material for magnesium secondary battery, positive electrode for magnesium secondary battery, and magnesium secondary battery

Patent metadata

Field	Value
Publication number	US-10256468-B2
Application number	US-201615580494-A
Country	US
Kind code	B2
Filing date	Jun 6, 2016
Priority date	Jun 10, 2015
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A positive electrode active material for a magnesium secondary battery, and a positive electrode for a magnesium secondary battery and a magnesium secondary battery in which the positive electrode active material is used are provided. The positive electrode active material consists of a magnesium composite oxide which is represented by Formula (1): Mg x M1 y M2 z O 2 and which has a rock salt-type crystal structure of space group Fm-3m. In Formula (1), M1 is Ni, Co, or Mn, M2 is different from M1 and is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, Cu, Nb, W, Mo, and Ru, 0<x≤1, 0<y<2, 0<z<1; and 1.5≤x+y+z≤2.0.

First claim

What is claimed is:

1. A positive electrode active material for a magnesium secondary battery, the positive electrode active material consisting of a magnesium composite oxide that is represented by the following Formula (1) and that has a rock salt-type crystal structure of space group Fm-3m:
Mg x M1 y M2 z O 2   (1)

wherein, in Formula (1), M1 is Ni, Co, or Mn;
M2 is different from M1 and is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, Cu, Nb, W, Mo, and Ru;
0<x≤1;
0<y<2;
0<z<1; and
1.5≤x+y+z≤2.0.

2. The positive electrode active material for a magnesium secondary battery according to claim 1 , wherein M1 in Formula (1) is Ni.

3. The positive electrode active material for a magnesium secondary battery according to claim 1 , wherein M2 in Formula (1) is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu.

4. The positive electrode active material for a magnesium secondary battery according to claim 1 , wherein 0<x≤0.8, 0.5≤y<2, 0<z≤0.6, and 1.5≤x+y+z≤2.0.

5. A positive electrode for a magnesium secondary battery, the positive electrode comprising the positive electrode active material for a magnesium secondary battery according to claim 1 .

6. A magnesium secondary battery, comprising:
the positive electrode for a magnesium secondary battery according to claim 5 ;
a negative electrode; and
a non-aqueous electrolyte solution.

7. The positive electrode active material for a magnesium secondary battery according to claim 1 , wherein in Formula (1):
M1 is Ni; and
M2 is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu.

8. The positive electrode active material for a magnesium secondary battery according to claim 1 , wherein in Formula (1):
M1 is Ni;
M2 is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu;
0<x≤0.8;
0.5≤y<2;
0<z≤0.6; and
1.5≤x+y+z≤2.0.

9. The positive electrode for a magnesium secondary battery according to claim 5 , wherein in Formula (1):
M1 is Ni; and
M2 is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu.

10. The positive electrode for a magnesium secondary battery according to claim 5 , wherein in Formula (1):
M1 is Ni;
M2 is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu;
0<x≤0.8;
0.5≤y<2;
0<z≤0.6; and
1.5≤x+y+z≤2.0.

11. The magnesium secondary battery according to claim 6 , wherein in Formula (1):
M1 is Ni; and
M2 is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu.

12. The magnesium secondary battery according to claim 6 , wherein in Formula (1):
M1 is Ni;
M2 is at least one element selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu;
0<x≤0.8;
0.5≤y<2;
0<z≤0.6; and
1.5≤x+y+z≤2.0.

Assignees

• Univ Tokyo Science Found

Inventors

• Idemoto Yasushi
• Kitamura Naoto
• Ishida Naoya

Classifications

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/505

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

• H01M10/0566

  Liquid materials · CPC title

• C01P2002/72

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

• H01M2004/021

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