Cathode active material containing magnesium-transition metal composite oxide and magnesium secondary battery using the same

Patent metadata

Field	Value
Publication number	US-11018330-B2
Application number	US-201916273163-A
Country	US
Kind code	B2
Filing date	Feb 12, 2019
Priority date	Mar 22, 2018
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A cathode active material for magnesium secondary batteries contains a composite oxide represented by the formula Mg x M y O 2 , where M is at least one selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, Cu, and Mo; 1.0<x, and y<1.0.

First claim

What is claimed is:

1. A cathode active material for a magnesium secondary battery, the cathode active material comprising
a composite oxide represented by a formula MgxMyO2, where M is at least one selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, Cu, and Mo; 1.0<x≤1.71, and 0.29≤y<1.0.

2. The cathode active material according to claim 1 , wherein 1.0<x≤1.3, and 0.7≤y<1.0.

3. The cathode active material according to claim 1 , wherein M is at least one selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu.

4. The cathode active material according to claim 1 , wherein M is at least one selected from the group consisting of Co and Mn.

5. The cathode active material according to claim 1 , wherein M comprises Mn.

6. The cathode active material according to claim 1 , wherein x+y=2, and the composite oxide has a crystal structure that belongs to space group FM-3M.

7. The cathode active material according to claim 1 , wherein the cathode active material is further mixed with at least one of a binder or a conductor.

8. A magnesium secondary battery comprising:
a cathode containing the cathode active material according to claim 1 ;
an anode;
and an electrolyte that conducts magnesium ions, wherein
the composite oxide in the cathode active material has a composition represented by the formula when the battery is completely discharged.

9. The magnesium secondary battery according to claim 8 , wherein the anode contains metallic magnesium or a magnesium-containing alloy.

10. The magnesium secondary battery according to claim 8 , wherein the anode consists of an anode collector on which metallic magnesium is dissolved and deposited.

11. The magnesium secondary battery according to claim 8 , wherein 1.0<x≤1.3, and 0.7≤y<1.0.

12. The magnesium secondary battery according to claim 8 , wherein M is at least one selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, and Cu.

13. The magnesium secondary battery according to claim 8 , wherein M is at least one selected from the group consisting of Co and Mn.

14. The magnesium secondary battery according to claim 8 , wherein M comprises Mn.

15. The magnesium secondary battery according to claim 8 , wherein x+y=2, and the composite oxide has a crystal structure that belongs to space group FM-3M.

16. The magnesium secondary battery according to claim 8 , wherein the cathode active material is further mixed with at least one of a binder or a conductor.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kume Toshiro
• Tei Go

Classifications

• H01M4/131 Primary

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

• H01M2004/028

  Positive electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/054

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