# US 12,224,118 B1 · Structure of an asymmetric supercapacitor and method of preparation thereof

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- Number: US 12,224,118 B1
- Document ID: US12224118B1
- Status: Granted
- Kind: B1
- Application number: 18/122,403
- Filed: 2023-03-16
- Granted: 2025-02-11
- Earliest claimed: 2023-03-16
- Assignees: University of Sharjah
- Applicants: University of Sharjah
- Inventors: Abdul Ghani Olabi; Mohammad Ali; Pragati Ankush Shinde
- Web page: https://patentgrep.com/patent/US12224118B1

## CPC

- H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34)
- H01G 11/26: characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
- H01G 11/32: Carbon-based
- H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes
- H01G 11/46: Metal oxides
- Y02E 60/13: Energy storage using capacitors
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A structure of an asymmetric supercapacitor and a preparation method thereof is disclosed. In some implementations, the preparation comprises the steps of forming a polyaniline (PANI) nanowire on carbon cloth (CC) substrate (PANI/CC) by polymerization of an aniline, depositing a cobalt-nickel layer double hydroxides (CoNi-LDHs) on the PANI/CC by a hydrothermal process, and calcining of the cobalt-nickel layer double hydroxides (CoNi-LDHs) in the PANI/CC at a high temperature to form a metal carbide (CoC@NiC) on the carbon cloth. The structure of the asymmetric supercapacitor includes a metal carbide (CoC@NiC) as a positive electrode, a tungsten trioxide (WO3@C) as a negative electrode, and a poly (vinyl alcohol)/Potassium hydroxide (PVA/KOH) as an electrolyte gel.

## Claims

### Claim 1

A method for preparation of an asymmetric supercapacitor comprising:
forming a polyaniline (PANI) nanowire on a carbon cloth (CC) substrate (PANI/CC) by polymerization of aniline;
depositing cobalt-nickel layer double hydroxide (CoNi-LDH) on the PANI/CC by a hydrothermal process; and
calcining the cobalt-nickel layer double hydro hydroxide (CoNi-LDH) in the PANI/CC at 800° C. to form a metal carbide (CoC@NiC) on the carbon cloth.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the polyaniline (PANI) nanowires are used as a primary carbon source.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the metal carbide (CoC@NiC) is used as an electrode for the asymmetric supercapacitor.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein a testing process of the metal carbide (CoC@NiC) electrode shows a maximum specific capacity of 184 mA h g−1 at a current density of 1 A g−1.

### Claim 5 (depends on 3)

The method as claimed in claim 3, wherein the metal carbide (CoC@NiC) electrode offers numerous electroactive sites and expressways for electron diffusion or transportation.

### Claim 6 (depends on 3)

The method as claimed in claim 3, wherein the preparation method of the metal carbides (CoC@NiC) reduces the electronic states of the metal carbide (CoC@NiC) electrode and improves an electrical conductivity.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein a stacked design of metal carbide (CoC@NiC) architectures directly on the carbon cloth (CC) substrate reduces a dead volume and resistance from additives.