Preparatory process of sodium ion supercapacitor based on carbon nanotubes

Abstract

The sodium-ion supercapacitor based on carbon nanotubes and its preparation method include the following steps: attaching a plurality of carbon nanotube materials to a conductive substrate with a conductive adhesive to form a working electrode; placing a separator between two working electrodes; and immersing the two working electrodes and the separator in a sodium-ion electrolyte. The supercapacitor prepared by the above method has high electrochemical performance, excellent durability and reliability.

Claims

1. A method for fabricating a sodium-ion supercapacitor based on carbon nanotubes, comprising: step S1: attaching a plurality of carbon nanotube materials to a conductive substrate using a conductive adhesive to form a working electrode; and step S2: placing a separator between two working electrodes, and immersing the two working electrodes and the separator in a sodium-ion electrolyte; wherein, The working electrode comprises: a first working electrode comprising a first region and a second region, the first region and the second region being disposed adjacent to each other, wherein a plurality of the carbon nanotube materials are disposed in the first region; and a second working electrode comprising a third region and a fourth region, the third region and the fourth region being disposed adjacent to each other, wherein a plurality of the carbon nanotube materials are disposed in the third region; and the first region and the fourth region are correspondingly disposed.

2. The preparation method as described in claim 1, wherein, This carbon nanotube material is a powdered, three-dimensional, bundled, multi-walled carbon nanotube material.

3. The preparation method as described in claim 1, wherein, The conductive substrate includes a glass substrate of indium tin oxide, a glass substrate of zinc aluminum oxide, a glass substrate of yttrium aluminum oxide, a glass substrate of titanium nitride, or a glass substrate of zirconium nitride; the conductive adhesive material includes conductive graphite adhesive, conductive carbon paint, conductive carbon ribbon, conductive carbon glue, conductive silver paste, conductive silver paint, or conductive gold paste.

4. The preparation method as described in claim 1, wherein, The conductive adhesive material is attached to one or both sides of the conductive substrate.

5. The preparation method as described in claim 1, wherein, The carbon nanotube material is attached to the conductive adhesive material under pressure.

6. The preparation method as described in claim 1, wherein, The membrane is a fibrous electronic insulating material, including polypropylene membrane, glass fiber membrane, polyester fiber membrane, polyimide fiber membrane or nanofiber membrane.

7. The preparation method as described in claim 1, wherein, The sodium ion electrolyte contains aqueous solutions of sodium hydroxide, sodium chloride, sodium carbonate, sodium sulfate, sodium acetate, sodium phosphate, sodium perchlorate, or sodium nitrate.

8. The preparation method as described in claim 1, wherein, The sodium ion electrolyte contains concentrations ranging from 0.5 M to 1.0 M.

9. The preparation method as described in claim 1, wherein, The second region is not attached with a plurality of the carbon nanotubes; or, the second region is also attached with a plurality of the carbon nanotubes, and the number of the plurality of the carbon nanotubes attached per unit area in the second region is less than the number of the plurality of the carbon nanotubes attached per unit area in the first region; and the fourth region is not attached with a plurality of the carbon nanotubes; or, the fourth region is also attached with a plurality of the carbon nanotubes, and the number of the plurality of the carbon nanotubes attached per unit area in the fourth region is less than the number of the plurality of the carbon nanotubes attached per unit area in the third region.

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