Method of preparing a vanadium oxide compound and use thereof in electrochemical cells

Patent metadata

Field	Value
Publication number	US-10263253-B2
Application number	US-201414761581-A
Country	US
Kind code	B2
Filing date	Feb 4, 2014
Priority date	Feb 4, 2013
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Electrochemical cell comprising an anode and a cathode is provided. The anode and the cathode independently comprises or consists essentially of a vanadium oxide compound having general formula MnV6O16, wherein M is selected from the group consisting of ammonium, alkali-metal, and alkaline-earth metal; and n is 1 or 2. Method of preparing a vanadium oxide compound having general formula MnV6O16 is also provided.

First claim

The invention claimed is:

1. A method of preparing a vanadium oxide compound of general formula (I)
M n V 6 O 16   (I),

wherein M is selected from the group consisting of ammonium, alkali-metal, and alkaline-earth metal; and n is 1 or 2;
the method comprising heating a mixture comprising vanadium oxide and an alkaline solution of M under hydrothermal conditions to form the vanadium oxide compound.

2. The method according to claim 1 , wherein M is selected from the group consisting of ammonium, sodium, potassium, lithium, calcium and magnesium.

3. The method according to claim 1 , wherein the vanadium oxide compound is a nanostructured vanadium oxide compound comprising nanobelts, microrods, nanorods, nanofibers, or combinations thereof.

4. The method according to claim 3 , wherein the nanobelts have an average diameter in the range of about 50 nm to about 100 nm.

5. The method according to claim 3 , wherein the nanorods have an average length in the range of about 1 μm to about 10 μm.

6. The method according to claim 1 , wherein the alkaline solution is a hydroxide or an acetate of M.

7. The method according to claim 1 , wherein heating a mixture comprising vanadium oxide and an alkaline solution of M under hydrothermal conditions comprises heating the mixture in an autoclave at a temperature in the range of about 120° C. to about 300° C.

8. The method according to claim 1 , further comprising drying the vanadium oxide compound at a temperature in the range of about 25° C. to about 120° C.

9. The method according to claim 1 , further comprising calcination of the vanadium oxide compound at a temperature in the range of about 200° C. to about 400° C.

10. An electrochemical cell comprising an anode and a cathode, wherein the anode and the cathode independently comprise a vanadium oxide compound of general formula (I)
M n V 6 O 16   (I),

wherein M is selected from the group consisting of ammonium, alkali-metal, and alkaline-earth metal; and n is 1 or 2.

11. The electrochemical cell according to claim 10 , wherein M is selected from the group consisting of ammonium, sodium, potassium, lithium, calcium and magnesium.

12. The electrochemical cell according to claim 10 , wherein the vanadium oxide compound is a nanostructured vanadium oxide compound comprising nanobelts, nanorods, microrods, nanofibers, or combinations thereof.

13. The electrochemical cell according to claim 12 , wherein the nanobelts have an average diameter in the range of about 50 nm to about 100 nm.

14. The electrochemical cell according to claim 12 , wherein the nanorods have an average length in the range of about 1 μm to about 10 μm.

15. The electrochemical cell according to claim 10 , wherein the anode and the cathode independently further comprise a binder.

16. The electrochemical cell according to claim 10 , wherein the anode and the cathode independently further comprise an electrically conductive agent.

17. The electrochemical cell according to claim 16 , wherein the weight ratio of vanadium oxide compound: binder: electrically conductive agent is about 75:15:10.

18. The electrochemical cell according to claim 10 , wherein the anode and the cathode have the same composition.

19. The electrochemical cell according to claim 10 , wherein the electrochemical cell is an aqueous rechargeable battery.

20. An electrochemical cell comprising an anode and a cathode, wherein the anode and the cathode independently comprises Li 3 V 6 O 16 .

Assignees

• Univ Nanyang Tech

Inventors

• Nair Vivek
• Srinivasan Madhavi
• Cheah Yan Ling

Classifications

• H01M4/624

  Electric conductive fillers · CPC title

• C01G31/006

  Compounds containing vanadium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• H01M10/36

  Accumulators not provided for in groups H01M10/05-H01M10/34 · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title