Stretchable flexible supercapacitor and preparation method thereof

Abstract

The invention relates to a stretchable flexible supercapacitor and a preparation method of the stretchable flexible supercapacitor. The stretchable flexible supercapacitor takes an electrochemical active substance / carbon-based material supported composite material as an electrode, adopts polyacrylamide gel with high stretchability and high viscosity as electrolyte, and is of a sandwiched structure, wherein when the stretch rate of the stretchable flexible supercapacitor is up to 150%, the specific capacitance of the stretchable flexible supercapacitor is basically unchanged; the capacitance degradation of the stretchable flexible supercapacitor is less than or equal to 10% after the stretchable flexible supercapacitor is charged-discharged circularly for 3000 times at the electric current density of 3mA / cm<2>. The defect that in the existing assembling technology of the stretchable flexible supercapacitor, a stretchable substrate is required is eliminated by virtue of the strong adhesion between the gel electrolyte and the flexible electrode of the stretchable flexible supercapacitor, and the assembling process is simplified.

Description

technical field

[0001] The invention relates to a stretchable flexible energy storage element and a preparation method thereof, in particular to a stretchable flexible supercapacitor and a preparation method thereof, belonging to the technical field of new energy. Background technique

[0002] Stretchable energy storage elements (such as supercapacitors, lithium batteries, and solar cells, etc.) are generally assembled from flexible gel electrolytes and flexible electrodes in a specific way, and they still maintain excellent electrical properties under stretching, bending, and folding. chemical properties. It is a research hotspot in the field of new energy.

[0003] Peng Huisheng and others reported that using polydimethylsiloxane as a stretchable substrate, carbon nanotube / polyaniline composite material as an electrode, and polyvinyl alcohol / phosphoric acid gel as an electrolyte, a stretchable and stretchable Color-changing supercapacitor (CN103903870A).

[0004] The su...

Examples

Embodiment 1～6

[0067] Embodiment 1~6 polyacrylamide gel preparation embodiment

Embodiment 1

[0069] (1) Preparation of water-soluble acrylate-terminated polyurethane macromolecular crosslinking agent

[0070] With 10.0g (0.01mol) polyethylene glycol 1000 as the soft segment, 13.34g (0.06mol) isophorone diisocyanate and 2.68g (0.02mol) 2,2-dimethylolpropionic acid chain extender as Hard segment, with 0.08g of dibutyltin dilaurate as a catalyst, pre-polymerized at 80°C for 3 hours in an argon atmosphere and acetone solvent; The pre-polymerized product was reacted for 12 hours to end-cap, and 2.02 g (0.02 mol) of triethylamine was used to react at room temperature for 1.5 hours to neutralize the end-capped product. Finally, the neutralized product was dissolved with deionized water, and the acetone solvent was removed in vacuum to obtain a water-soluble acrylate-terminated polyurethane (abbreviated as "crosslinking agent-1");

[0071] (2) Preparation of stretchable polyacrylamide gel

[0072] Stir and mix 0.04g of "Crosslinking Agent-1" obtained from step (1), 1.0g of ...

Embodiment 2

[0081] (1) Preparation of water-soluble acrylate-terminated polyurethane macromolecular crosslinking agent

[0082] With 20.0g (0.01mol) ethylene oxide-propylene oxide block copolymer diol 2000 as soft segment, with 17.74g (0.06mol) 4,4'-dicyclohexylmethane diisocyanate and 2.68g (0.02 mol) 2,2-dimethylol propionic acid chain extender is the hard segment, with 0.08g of dibutyltin dilaurate as the catalyst, pre-polymerized at 80°C in an argon atmosphere and butanone solvent for 4 hours; with 3.9g (0.06mol) 2-hydroxyethyl methacrylate was reacted at 45°C for 12 hours to block the prepolymerized product, and 1.18g (0.02mol) trimethylamine was used to react at room temperature for 1.5 hours to neutralize the blocked product . Finally, the neutralized product was dissolved with deionized water, and the methyl ethyl ketone solvent was removed in vacuum to obtain a water-soluble acrylate-terminated polyurethane macromolecular crosslinking agent (abbreviated as "crosslinking agent-2"...

technical field

[0001] The invention relates to a stretchable flexible energy storage element and a preparation method thereof, in particular to a stretchable flexible supercapacitor and a preparation method thereof, belonging to the technical field of new energy. Background technique

[0002] Stretchable energy storage elements (such as supercapacitors, lithium batteries, and solar cells, etc.) are generally assembled from flexible gel electrolytes and flexible electrodes in a specific way, and they still maintain excellent electrical properties under stretching, bending, and folding. chemical properties. It is a research hotspot in the field of new energy.

[0003] Peng Huisheng and others reported that using polydimethylsiloxane as a stretchable substrate, carbon nanotube / polyaniline composite material as an electrode, and polyvinyl alcohol / phosphoric acid gel as an electrolyte, a stretchable and stretchable Color-changing supercapacitor (CN103903870A).

[0004] The su...

Examples

Embodiment 1～6

[0067] Embodiment 1~6 polyacrylamide gel preparation embodiment

Embodiment 1

[0069] (1) Preparation of water-soluble acrylate-terminated polyurethane macromolecular crosslinking agent

[0070] With 10.0g (0.01mol) polyethylene glycol 1000 as the soft segment, 13.34g (0.06mol) isophorone diisocyanate and 2.68g (0.02mol) 2,2-dimethylolpropionic acid chain extender as Hard segment, with 0.08g of dibutyltin dilaurate as a catalyst, pre-polymerized at 80°C for 3 hours in an argon atmosphere and acetone solvent; The pre-polymerized product was reacted for 12 hours to end-cap, and 2.02 g (0.02 mol) of triethylamine was used to react at room temperature for 1.5 hours to neutralize the end-capped product. Finally, the neutralized product was dissolved with deionized water, and the acetone solvent was removed in vacuum to obtain a water-soluble acrylate-terminated polyurethane (abbreviated as "crosslinking agent-1");

[0071] (2) Preparation of stretchable polyacrylamide gel

[0072] Stir and mix 0.04g of "Crosslinking Agent-1" obtained from step (1), 1.0g of ...

Embodiment 2

[0081] (1) Preparation of water-soluble acrylate-terminated polyurethane macromolecular crosslinking agent

[0082] With 20.0g (0.01mol) ethylene oxide-propylene oxide block copolymer diol 2000 as soft segment, with 17.74g (0.06mol) 4,4'-dicyclohexylmethane diisocyanate and 2.68g (0.02 mol) 2,2-dimethylol propionic acid chain extender is the hard segment, with 0.08g of dibutyltin dilaurate as the catalyst, pre-polymerized at 80°C in an argon atmosphere and butanone solvent for 4 hours; with 3.9g (0.06mol) 2-hydroxyethyl methacrylate was reacted at 45°C for 12 hours to block the prepolymerized product, and 1.18g (0.02mol) trimethylamine was used to react at room temperature for 1.5 hours to neutralize the blocked product . Finally, the neutralized product was dissolved with deionized water, and the methyl ethyl ketone solvent was removed in vacuum to obtain a water-soluble acrylate-terminated polyurethane macromolecular crosslinking agent (abbreviated as "crosslinking agent-2"...

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