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Zinc-cobalt bimetallic oxide sandwich structure flexible film electrode and preparation method thereof

A double metal oxide, flexible film technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of narrow applicable voltage window, low energy density of supercapacitors, poor cycle stability, etc., to achieve high voltage range, good electrolyte absorption, good stability

Active Publication Date: 2021-01-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a simple synthesis of zinc-cobalt bimetal for the deficiencies in the prior art such as low energy density, narrow applicable voltage window and poor cycle stability of supercapacitors assembled with zinc-cobalt double oxide and bio-based material composite flexible electrodes. Oxide sandwich structure flexible film electrode and its preparation method, using zinc-cobalt double metal oxide to provide pseudocapacitance, multi-wal

Method used

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  • Zinc-cobalt bimetallic oxide sandwich structure flexible film electrode and preparation method thereof
  • Zinc-cobalt bimetallic oxide sandwich structure flexible film electrode and preparation method thereof
  • Zinc-cobalt bimetallic oxide sandwich structure flexible film electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] S1. Disperse 7g of cellulose nanofibril aqueous solution and 0.07g of multi-walled carbon nanotubes in 39.58mL of deionized water with a mass fraction of 1wt%, ultrasonically disperse for 30min (power 600W), and magnetically stir for 30min (700r / min), to obtain Uniform 0.3wt% cellulose nanofibril-multi-walled carbon nanotube dispersion;

[0039]S2. Dissolve 0.328g of 2-methylimidazole in 25mL of methanol, and record it as solution A, and stir magnetically for 10min (600r / min); dissolve 0.323g of cobalt nitrate hexahydrate and 0.06g of zinc nitrate hexahydrate in 25mL of methanol, record For solution B, after magnetically stirring for 10min (600r / min), mix A and B solutions, magnetically stir for 10min (600r / min), place at room temperature for 24h, centrifuge (6500r / min) for 8min to obtain a purple precipitate, and use anhydrous Washing with ethanol three times, and vacuum-drying at 80° C. to obtain a zinc-cobalt bimetallic organic framework composite. The zinc-cobalt d...

Embodiment 2

[0047] S1. Disperse 13g of cellulose nanofibril aqueous solution and 0.13g of multi-walled carbon nanotubes in 38.87mL of deionized water with a mass fraction of 1wt%, ultrasonically disperse for 30min (power 600W), and magnetically stir for 30min (700r / min), to obtain Uniform 0.5wt% cellulose nanofibril-multi-walled carbon nanotube dispersion;

[0048] S2. Dissolve 0.328g of 2-methylimidazole in 25mL of methanol, and record it as solution A, and stir magnetically for 10min (600r / min); dissolve 0.323g of cobalt nitrate hexahydrate and 0.06g of zinc nitrate hexahydrate in 25mL of methanol, record For solution B, after magnetic stirring for 10 minutes (600r / min), mix the two solutions of A and B, magnetic stirring for 10 minutes (600r / min), and place at room temperature for 24 hours. Centrifuge (6500r / min) for 8min to obtain a purple precipitate, wash with absolute ethanol three times, and vacuum-dry at 80°C to obtain a zinc-cobalt bimetallic organic framework complex. The zinc...

Embodiment 3

[0056] S1. Disperse 7g of cellulose nanofibril aqueous solution and 0.07g of multi-walled carbon nanotubes in 39.58mL of deionized water with a mass fraction of 1wt%, ultrasonically disperse for 30min (power 600W), and magnetically stir for 30min (700r / min), to obtain Uniform 0.3wt% cellulose nanofibril-multi-walled carbon nanotube dispersion;

[0057] S2. Dissolve 0.328g of 2-methylimidazole in 25mL of methanol, and record it as solution A, and stir magnetically for 10min (600r / min); dissolve 0.323g of cobalt nitrate hexahydrate and 0.06g of zinc nitrate hexahydrate in 25mL of methanol, record For solution B, after magnetic stirring for 10 minutes (600r / min), mix the two solutions of A and B, magnetic stirring for 10 minutes (600r / min), and place at room temperature for 24 hours. Centrifuge (6500r / min) for 8min to obtain a purple precipitate, wash with absolute ethanol three times, and vacuum-dry at 80°C to obtain a zinc-cobalt bimetallic organic framework complex. The zinc-...

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Abstract

The invention provides a preparation method of a zinc-cobalt bimetallic oxide sandwich structure flexible film electrode, which is based on a vacuum filtration method. The method comprises the following steps: (1) dispersing cellulose nanofibrils and multi-walled carbon nanotubes in water, and carrying out ultrasonic and magnetic stirring to obtain a uniform cellulose nanofibril multi-walled carbon nanotube dispersion liquid; (2) dispersing the cellulose nanofibril and zinc-cobalt bimetal oxide in water, and performing ultrasonic and magnetic stirring to obtain uniform cellulose nanofibril zinc-cobalt bimetal oxide dispersion liquid; (3) sequentially carrying out suction filtration on the cellulose nano-fibril multi-walled carbon nanotube dispersion liquid and the cellulose nano-fibril zinc-cobalt bimetallic oxide dispersion liquid to form a film, so as to obtain the coating layer sandwich layer coating layer sandwich structure flexible film electrode. The method disclosed in the invention aims to prepare the high-performance flexible light electrode material, and has a wide application prospect in the field of portable electronic and energy products.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode preparation, and in particular relates to a zinc-cobalt double metal oxide sandwich structure flexible film electrode and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional batteries and electrolytic capacitors. Its power density is higher than that of batteries, and its energy density is higher than that of traditional capacitors. It has a wide temperature range and a high safety factor. It has become a new industry in the field of chemical power sources. highlights. According to different charging and discharging mechanisms, supercapacitors are divided into electric double layer capacitors and Faraday pseudocapacitors. Electric double layer capacitors use the potential difference formed on the surface of the positive and negative electrodes to store energy through the process of charge adsorption / ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46H01G11/26
CPCH01G11/26H01G11/46H01G11/86
Inventor 李凯刘文青尚煜豪崔斐李坚斌
Owner GUANGXI UNIV
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