Magnesium battery having a cathode containing manganese dioxide nanoparticles as active material

Patent metadata

Field	Value
Publication number	US-9413004-B2
Application number	US-201313850695-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Mar 26, 2013
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A MnO 2 electrode active material of high capacity is provided. The high capacity MnO 2 has a surface area which is greater than 60 m 2 /g and the MnO 2 is obtained by a process comprising a redox reaction of a Mn (II) salt and permanganate at a reaction temperature less than 30° C. and a pH of 2 to 4. Also provided are a magnesium electrochemical cell having a cathode containing the MnO 2 and a rechargeable magnesium battery having a cathode containing the MnO 2 .

First claim

The invention claimed is:

1. A magnesium cell, comprising:
an anode comprising magnesium;
a non-aqueous electrolyte; and
a cathode comprising MnO 2 nanoparticles;
wherein
a surface area of the MnO 2 nanoparticles is greater than 60 m 2 /g,
the MnO 2 nanoparticles comprise at least one phase selected from the group consisting of α-MnO 2 , β-MnO 2 , δ-MnO 2 , and γ-MnO 2 , and
the MnO 2 nanoparticles are obtained by a process comprising a redox reaction of a Mn(II) salt and permanganate at a reaction temperature less than 30° C. and a pH of 2 to 4.

2. The magnesium cell of claim 1 , wherein the MnO 2 nanoparticles are heat treated at a temperature less than 400° C. for drying and calcination.

3. The magnesium cell of claim 2 , wherein a maximum temperature to which the MnO 2 nanoparticles are exposed is the temperature for drying and calcination.

4. The magnesium cell of claim 1 , wherein the non-aqueous electrolyte comprises an organic solvent, an aprotic liquid or a polymer infused with magnesium ions.

5. The magnesium cell of claim 4 , comprising an organic solvent wherein the organic solvent is an ether selected from the group consisting of tetrahydrofuran, ethylene glycol dimethyl ether and his 2-methoxy ethyl ether.

6. The magnesium cell of claim 1 , wherein the cathode further comprises an additive selected from the group consisting of V 2 O 5 , a hollandiate of vanadium and a hollandiate of titanium.

7. The magnesium cell of claim 1 , further comprising a separator between the anode and cathode.

8. The magnesium cell of claim 1 , wherein the anode further comprises carbon particles.

9. A rechargeable magnesium battery, comprising the magnesium cell of claim 1 .

10. The rechargeable magnesium battery of claim 9 , wherein the MnO 2 nanoparticles are heat treated at a temperature less than 400° C. for drying and calcination.

11. The rechargeable magnesium battery of claim 9 , wherein a maximum temperature to which the MnO 2 nanoparticles are exposed is the temperature for drying and calcination.

12. The rechargeable magnesium battery of claim 9 , wherein the non-aqueous electrolyte comprises an organic solvent, an aprotic liquid or a polymer infused with magnesium ions.

13. The rechargeable magnesium battery of claim 12 , comprising an organic solvent wherein the organic solvent is an ether selected from the group consisting of tetrahydrofuran, ethylene glycol dimethyl ether and bis 2-methoxy ethyl ether.

14. The rechargeable magnesium battery of claim 9 , wherein the cathode further comprises an additive selected from the group consisting of V 2 O 5 , a hollandiate of vanadium and a hollandiate of titanium.

15. The rechargeable magnesium battery of claim 9 , further comprising a separator between the anode and cathode.

16. The rechargeable magnesium battery of claim 9 , wherein the anode further comprises carbon particles.

Assignees

• Toyota Motor Eng & Mfg North America Inc

Inventors

• Zhang Ruigang
• Mizuno Fuminori

Classifications

• H01M4/381

  Alkaline or alkaline earth metals elements (H01M4/40 takes precedence) · CPC title

• H01M10/054

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

• H01M4/466

  Magnesium based · CPC title

• H01M4/505

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

• H01M4/502 Primary

  for non-aqueous cells (H01M4/505 takes precedence) · CPC title