Energy storage device including a cobalt-based compound electrode

Patent metadata

Field	Value
Publication number	US-11075380-B2
Application number	US-201816035967-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Jul 16, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A system and method for an energy storage device including a first electrode and a second electrode; the second electrode including a cobalt based compound; and an electrolyte disposed between the first electrode and the second electrode.

First claim

The invention claimed is:

1. An energy storage device comprising:
a first electrode and a second electrode;
the second electrode comprising a cobalt based compound; and
an electrolyte disposed between the first electrode and the second electrode,
wherein the second electrode comprises a freestanding Cobalt cathode and the first electrode comprises a freestanding Zinc anode,
wherein the cathode comprises a carbon cloth, a plurality of Cobalt (III) oxide nanorods disposed on and/or interspersed through a portion of the carbon cloth such that the nanorods are immobilized on or within the carbon cloth.

2. The energy storage device in accordance with claim 1 , wherein the cathode is synthesized by growing a plurality of Cobalt (III) oxide nanorods on the carbon cloth using urea, ammonium fluoride an excess Cobalt salt, the nanorods being grown by a hydrothermal process.

3. The energy storage device in accordance with claim 1 , wherein the length of the Cobalt (III) oxide nanorods comprise a diameter between 100 nm to 300 nm.

4. The energy storage device in accordance with claim 1 , wherein the plurality of Cobalt (III) oxide nanorods are arranged in a bundle and wherein the bundle of rods comprises a diameter of between 0.5 micrometres to 2 micrometres.

5. The energy storage device in accordance with claim 1 , wherein each nanorod comprises one or more nanocrystals.

6. An energy storage device comprising:
a first electrode and a second electrode;
the second electrode comprising a cobalt based compound; and
an electrolyte disposed between the first electrode and the second electrode,
wherein the electrolyte comprises Zinc Sulfate and Cobalt Sulfate.

7. The energy storage device in accordance with claim 6 , wherein the electrolyte comprises a polyacrylamide hydrogel with the Zinc Sulfate and Cobalt Sulfate added into the hydrogel.

8. An energy storage device comprising:
a first electrode and a second electrode;
the second electrode comprising a cobalt based compound; and
an electrolyte disposed between the first electrode and the second electrode,
wherein the energy storage device is flexible in bending such that the energy storage can elastically deform while maintaining electrochemical performance of the energy storage device; and
wherein the energy storage device is flexible in bending such that the energy storage device can be bent to an angle of 90 degrees for 1000 times without mechanical or structural damage.

9. An energy storage device comprising:
a first electrode and a second electrode;
the second electrode comprising a cobalt based compound; and
an electrolyte disposed between the first electrode and the second electrode, wherein the energy storage device comprises an operating voltage of at least 1.8V, a capacity of at least 200 mAh.g −1 and a capacity retention of at least 90% over 5000 cycles.

10. The energy storage device in accordance with claim 1 , wherein the cobalt based compound of the second electrode is a cobalt oxide.

11. The energy storage device in accordance with claim 6 , wherein the cobalt based compound of the second electrode is a cobalt oxide.

12. The energy storage device in accordance with claim 8 , wherein the cobalt based compound of the second electrode is a cobalt oxide.

13. The energy storage device in accordance with claim 9 , wherein the cobalt based compound of the second electrode is a cobalt oxide.

14. The energy storage device in accordance with claim 10 , wherein the cobalt oxide comprises Cobalt (III) oxide defined as Co 3 O 4 .

15. The energy storage device in accordance with claim 11 , wherein the cobalt oxide comprises Cobalt (III) oxide defined as Co 3 O 4 .

16. The energy storage device in accordance with claim 12 , wherein the cobalt oxide comprises Cobalt (III) oxide defined as Co 3 O 4 .

17. The energy storage device in accordance with claim 13 , wherein the cobalt oxide comprises Cobalt (III) oxide defined as Co 3 O 4 .

18. The energy storage device in accordance with claim 1 , wherein the energy storage device is a rechargeable battery.

19. The energy storage device in accordance with claim 6 , wherein the energy storage device is a rechargeable battery.

20. The energy storage device in accordance with claim 8 , wherein the energy storage device is a rechargeable battery.

21. The energy storage device in accordance with claim 9 , wherein the energy storage device is a rechargeable battery.

Assignees

• Univ City Hong Kong

Inventors

• Zhi Chunyi
• Ma Longtao

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/244

  Zinc electrodes · CPC title

• H01M10/0567

  characterised by the additives · CPC title