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Flexible integrated carbon-coated tungsten oxide/carbon nanotube film composite electrode and preparation method thereof

A carbon nanotube thin film and composite electrode technology, which is applied in electrode manufacturing, electrode rolling/calendering, hybrid capacitor electrodes, etc., can solve the problems of battery capacity attenuation, poor bonding force, easy damage and falling off, etc.

Active Publication Date: 2021-04-23
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual method is to use ultrasonic and filtration technology to prepare tungsten oxide / carbon nanotube film (or graphene) composite material, which can be directly used as electrode material, showing good cycle performance and rate performance. However, the direct load on the flexible conductive substrate Electrode materials often face the practical problems of poor binding force and easy breakage and falling off during the folding process, which makes the battery capacity decay quickly and even causes a series of safety accidents

Method used

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  • Flexible integrated carbon-coated tungsten oxide/carbon nanotube film composite electrode and preparation method thereof
  • Flexible integrated carbon-coated tungsten oxide/carbon nanotube film composite electrode and preparation method thereof
  • Flexible integrated carbon-coated tungsten oxide/carbon nanotube film composite electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 1 g of tungsten hexachloride in 50 mL of a mixed solution (25 mL of absolute ethanol and 25 mL of deionized water), ultrasonically disperse it, and place it in a spray pot. In the preparation of carbon nanotube film (10*30 cm 2 ) while spraying the mixed solution evenly on the surface of the carbon nanotube bundles. The sprayed composite film is left to stand, air-dried, and cut. The cut composite film was placed in a high-pressure reactor for solvothermal reaction. The solvent in the reaction kettle was a mixed solution of absolute ethanol and water, with a volume ratio of 1:1 (60 mL water: 60 mL absolute ethanol); the reaction temperature was 180 °C, and the reaction time was 4 h. Cool naturally after the reaction, take out the composite film, and dry naturally. Put the dried composite film in a high-temperature reaction furnace, under a nitrogen atmosphere, calcine at a temperature of 500 °C, and hold for 1 h. After cooling, an integrated carbon-coated tu...

Embodiment 2

[0024] Dissolve 1g of tungsten hexachloride and 1g of citric acid in 50 mL of mixed solution (25 mL of absolute ethanol and 25 mL of deionized water), ultrasonically disperse, and place in a spray pot. In the preparation of carbon nanotube film (10*30 cm 2 ) while spraying the mixed solution evenly on the surface of the carbon nanotube bundles. The sprayed composite film is left to stand, air-dried, and cut. The cut composite film was placed in a high-pressure reactor for solvothermal reaction. The solvent in the reaction kettle was a mixed solution of absolute ethanol and water, with a volume ratio of 1:1 (60 mL water: 60 mL absolute ethanol); the reaction temperature was 180 °C, and the reaction time was 4 h. Cool naturally after the reaction, take out the composite film, and dry naturally. Put the dried composite film in a high-temperature reaction furnace, under nitrogen atmosphere, calcination temperature is 500 °C, holding time is 1 h, and the integrated carbon-coated...

Embodiment 3

[0026] Dissolve 1 g of tungsten hexachloride and 2 g of citric acid in 50 mL of mixed solution (25 mL of absolute ethanol and 25 mL of deionized water), ultrasonically disperse, and place in a spray pot. In the preparation of carbon nanotube film (10*30 cm 2 ) while spraying the mixed solution evenly on the surface of the carbon nanotube bundles. The sprayed composite carbon film is left to stand, air-dried and cut. The cut composite film was placed in a high-pressure reactor for solvothermal reaction. The solvent in the reaction kettle was a mixed solution of absolute ethanol and water, the volume ratio was 2:1 (80 mL absolute ethanol: 40 mL water); the reaction temperature was 180 °C, and the reaction time was 4 h. Cool naturally after the reaction, take out the composite film, and dry naturally. Put the dried composite film in a high-temperature reaction furnace, under a nitrogen atmosphere, calcine at a temperature of 500 °C, hold for 2 h, and obtain an integrated carbo...

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Abstract

The invention discloses a preparation method of a flexible integrated carbon-coated tungsten oxide / carbon nanotube film composite electrode, and belongs to the technical field of electrochemical energy storage and conversion. In the process of preparing a carbon nanotube film, a tungsten salt solution is sprayed on the surface of a carbon nanotube bundle by adopting a spraying technology to form a carbon nanotube film / tungsten salt / carbon nanotube film layer-by-layer self-assembly composite precursor; the composite precursor is put into a high-pressure reaction kettle for solvothermal reaction; after the reaction is finished, cooling is performed to room temperature, and drying is preformed to obtain a composite membrane; and the dried composite film is put into a tubular furnace, and calcining is performed in a nitrogen atmosphere to obtain the carbon-coated tungsten oxide / carbon nanotube film composite material. And the film material is rolled and punched to obtain the flexible integrated carbon-coated tungsten oxide / carbon nanotube film composite electrode. The electrode has the characteristics of flexibility, light weight, binder prevention, simple preparation process and the like, is beneficial to batch production, and can be applied to the fields of electrochemical energy storage and conversion of lithium ion batteries, supercapacitors, fuel cells, water electrolysis and the like.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a preparation method of a flexible integrated carbon-coated tungsten oxide / carbon nanotube film composite electrode. Background technique [0002] With the rapid development of electrode technology, flexible wearable devices have gradually entered the field of vision of the general public. The electrode materials are loaded on various flexible conductive substrates, so that the prepared device has the characteristics of foldability and strong portability, which is in line with the development trend of various new electronic devices. As an active material, tungsten oxide can undergo a unique conversion reaction with lithium ions, and its theoretical specific capacity (693 mAh g -1 ) than that of commercial graphite (372 mAh g -1 ) is higher, and has the characteristics of low cost, high inherent density, safety and pollution-free, and has become a potential lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/66H01M4/131H01M4/1391H01M4/04H01M10/0525H01M4/86H01M4/88H01M4/90H01G11/24H01G11/32H01G11/46H01G11/68C25B1/04C25B11/042
CPCH01M4/362H01M4/483H01M4/62H01M4/625H01M4/628H01M4/131H01M4/1391H01M4/0435H01M4/0404H01M4/0419H01M4/663H01M10/0525H01M4/9016H01M4/9083H01M4/8647H01M4/8803H01M4/8828H01M4/8875H01M4/8896H01G11/24H01G11/32H01G11/46H01G11/68C25B1/04C25B11/04Y02E60/10Y02E60/13Y02E60/36Y02E60/50
Inventor 尹艳红文敏吴子平黎业生刘先斌张克邓朋湛钦淇高文静
Owner JIANGXI UNIV OF SCI & TECH
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