Split cell supercapacitor

Patent metadata

Field	Value
Publication number	US-11955279-B2
Application number	US-202318364504-A
Country	US
Kind code	B2
Filing date	Aug 3, 2023
Priority date	Feb 22, 2022
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A nanocomposite electrode and a supercapacitor device including said nanocomposite electrode. The nanocomposite electrode includes a mixture of at least one binding compound, at least one conductive additive, and at least one molybdenum doped carbon material coated onto a substrate. The supercapacitor device includes two nanocomposite electrodes disposed facing one another, wherein the substrate of each nanocomposite electrode is coated with the mixture on an inside facing surface and the outer surfaces of the nanocomposite electrodes are not coated with the mixture, and the inside facing surfaces are separated by at least one electrolyte.

First claim

The invention claimed is:

1. A split cell supercapacitor, comprising:
two nanocomposite electrodes, each nanocomposite electrode comprising:
a substrate;
at least one binding compound;
at least one conductive additive; and
at least one molybdenum doped carbon material;
wherein a mixture of 5-10 wt % of the at least one binding compound, 65-92 wt % of the at least one conductive additive, and 3-25 wt % of the at least one molybdenum doped carbon material based on the total weight of the at least one binding compound, the at least one conductive additive, and the at least one molybdenum doped carbon material, at least partially coats a surface of the substrate;

wherein the nanocomposite electrodes face one another, wherein the substrate of each nanocomposite electrode is at least partially coated with the mixture on an inside facing surface and the outer surfaces of each of the nanocomposite electrodes are not coated with the mixture; and
wherein the inside facing surfaces are separated by at least one gel electrolyte.

2. The split cell supercapacitor of claim 1 , wherein:
the at least one molybdenum doped carbon material is at least one selected from the group consisting of molybdenum doped graphene and molybdenum doped carbon nanotubes (CNTs);
the at least one binding compound is at least one selected from the group consisting of polyvinylidene fluoride and n-methylpyrrolidone;
the at least one conductive additive is at least one selected from the group consisting of graphite, activated carbon, reduced graphene oxide, carbon nanotubes, carbon nanofibers, and carbon black; and
the substrate is a formed from at least one material selected from the group consisting of copper, aluminum, nickel, iron, and steel.

3. The split cell supercapacitor of claim 1 , wherein the molybdenum in the at least one molybdenum doped carbon material is at least one selected from the group consisting of α-MoO 3 , β-MoO 3 , γ-MoO 3 .

4. The split cell supercapacitor of claim 1 , wherein molybdenum is homogeneously distributed throughout the at least one molybdenum doped carbon material.

5. The split cell supercapacitor of claim 1 , wherein the at least one molybdenum doped carbon material is molybdenum doped graphene;
the graphene of the at least one molybdenum doped carbon graphene has a sheet structure;
molybdenum is on a surface of sheets of the sheet structure; and
the at least one molybdenum doped graphene comprises 70-80 wt % C, 15-20 wt % O, 4-8 wt % H, and 3-10 wt % Mo, based on the total weight of the C, O, H, and Mo.

6. The split cell supercapacitor of claim 1 , wherein the at least one molybdenum doped carbon material is molybdenum doped CNTs;
the molybdenum doped CNTs have a diameter of 10-100 nm;
molybdenum is on walls of the CNTs; and
the molybdenum doped CNTs comprise 60-70 wt % C, 20-25 wt % O, 4-8 wt % H, and 10-20 wt % Mo, based on the total weight of the C, O, H, and Mo.

7. The split cell supercapacitor of claim 1 , wherein the thickness of the coating of the mixture on the substate is 500 nm-60 μm.

8. The split cell supercapacitor of claim 1 , wherein the at least one molybdenum doped carbon material is made by a method comprising:
heating a carbon material to at least 450° C. for 10 minutes to an hour to form a cracked carbon material;
wherein the carbon material is carbon nanotubes or graphene;
sonicating the cracked carbon material in water for at least 5 minutes to form a dispersion;
adjusting the pH of the dispersion to 1.5-3 with an acid to form a suspension;
mixing MoO 4 2− molybdate ion into the suspension and stirring for at least 48 hours at 20-25° C. to form a solution;
filtering, washing with water, and drying the solution at a temperature of at least 70° C. for at least 3 hours, to form the at least one molybdenum doped carbon material.

9. The split cell supercapacitor of claim 1 , wherein:
the gel electrolyte comprises at least one polyol compound mixed with at least one selected from the group consisting of an alkali metal hydroxide, an alkaline earth hydroxide, an alkali metal salt, and an alkaline earth salt;
wherein the polyol compound is at least one selected from the group consisting of glycerol, ethylene glycol, and propylene glycol.

10. The split cell supercapacitor of claim 1 , having:
an energy density of 40-60 Wh/kg at a specific power of 250-300 W/kg; and
wherein the mixture has 15-25 wt % of the at least one molybdenum doped carbon material; and
the at least one molybdenum doped carbon material is molybdenum doped graphene.

11. The split cell supercapacitor of claim 10 , having a specific capacitance of 450-500 F/g at 0.5-5 A/g.

12. The split cell supercapacitor of claim 11 , wherein at least 90% of an initial specific capacitance is maintained after 10,000 charge-discharge cycles.

13. The split cell supercapacitor of claim 11 , wherein at least 88% of the initial specific capacitance is maintained after 10,000 charge-discharge cycles.

14. The split cell supercapacitor of claim 1 , having an energy density of 30-50 Wh/kg at a specific power of 250-300 W/kg;
wherein the mixture has 15-25 wt % of the at least one molybdenum doped carbon material; and
the at least one molybdenum doped carbon material is molybdenum doped carbon nanotubes.

15. A supercapacitor device, comprising:
2-10 the split cell supercapacitors of claim 1 connected in parallel and/or series.

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Asiri Sarah Mousa Maadi
• Cevik Emre
• Bozkurt Ayhan

Classifications

• H01G11/56

  Solid electrolytes, e.g. gels; Additives therein · CPC title

• H01G11/38 Primary

  Carbon pastes or blends; Binders or additives therein · CPC title

• H01G11/36

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• H01G11/06 Primary

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title