Cathode active material containing boron and carbon, and magnesium secondary battery using the same

Patent metadata

Field	Value
Publication number	US-11081698-B2
Application number	US-201916384958-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Apr 23, 2018
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A cathode active material for magnesium secondary batteries includes a material containing magnesium, boron, and carbon. The material has a layered structure.

First claim

What is claimed is:

1. A magnesium secondary battery comprising:
a cathode containing a cathode active material;
an anode; and
an electrolyte that has magnesium ion conductivity, wherein the cathode active material comprises:
a material containing magnesium, boron, and carbon, wherein
the material has a layered structure,
the material includes a plurality of layers each containing the boron and the carbon, and
the magnesium is positioned between the layers.

2. The magnesium secondary battery according to claim 1 , wherein the material further contains lithium, and wherein the lithium is positioned in a space between the layers with a magnesium does not occupy.

3. The magnesium secondary battery according to claim 1 , wherein
the material further contains calcium, and wherein the calcium is positioned in a space between the layers where the magnesium does not occupy.

4. The magnesium secondary battery according to claim 1 , wherein the material is represented by a formula Mg x M y B z C 1-z , where M is Li or Ca, x>0, y≥0, and x+y<z<1.0.

5. The magnesium secondary battery according to claim 4 , wherein z≤0.5.

6. The magnesium secondary battery according to claim 5 , wherein M is Ca.

7. The magnesium secondary battery according to claim 6 , wherein z≤0.25.

8. The magnesium secondary battery according to claim 1 , wherein the magnesium is released from and occluded into the material in response to charging and discharging of the magnesium secondary battery.

9. The magnesium secondary battery according to claim 1 , wherein the anode contains magnesium metal or a magnesium-containing alloy.

10. The magnesium secondary battery according to claim 1 , wherein the anode consists of an anode collector on which magnesium metal is dissolved and deposited.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tei Go
• Kume Toshiro
• Kano Akira

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/366

  as layered products · CPC title

• H01M10/054

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

• C01B32/90 Primary

  Carbides · CPC title

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title