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Carbon nanotube/birnessite/graphene composite positive electrode material with hierarchical structure, preparation method and application

A graphene composite, carbon nanotube technology, applied in positive electrodes, structural parts, battery electrodes, etc., can solve problems such as poor performance of manganese dioxide electrodes

Active Publication Date: 2022-01-21
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, one or both of the above optimization strategies are used, but the performance of the obtained manganese dioxide electrode is still not good

Method used

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  • Carbon nanotube/birnessite/graphene composite positive electrode material with hierarchical structure, preparation method and application
  • Carbon nanotube/birnessite/graphene composite positive electrode material with hierarchical structure, preparation method and application
  • Carbon nanotube/birnessite/graphene composite positive electrode material with hierarchical structure, preparation method and application

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preparation example Construction

[0030] A method for preparing a carbon nanotube / birnessite / graphene composite positive electrode material with a hierarchical structure of the present invention comprises the following steps:

[0031] 1) Disperse a certain mass of surface-treated carbon nanotubes in an aqueous potassium permanganate solution with a concentration of 2-6 mg / mL, and the concentration of carbon nanotubes is 0.5-3 mg / mL;

[0032] The surface treatment method of carbon nanotubes is nitric acid acidification or plasma treatment, which is used to increase the oxygen-containing groups on the surface of carbon nanotubes to improve reactivity and hydrophilicity;

[0033] 2) Stir the mixed dispersion liquid obtained in 1) at room temperature for 1 hour, transfer it to a hydrothermal reaction kettle, keep it warm at 110-130°C for 5-6 hours, and naturally cool to room temperature;

[0034] 3) Centrifuge and wash the product obtained in 2) with deionized water for more than 5 times until the supernatant is n...

Embodiment 1

[0038] 1) Add 200mg of carbon nanotubes into 250mL of 5M nitric acid solution, heat and stir at 80 degrees for reflux for 24 hours, wash with deionized water until neutral, and obtain surface-treated carbon nanotubes after drying;

[0039] 2) Disperse 50 mg of surface-treated carbon nanotubes in 150 mL of 3 mg / mL potassium permanganate solution, stir at room temperature for 1 hour, transfer to three 100 mL hydrothermal reactors, react at 120 ° C for 5 hours, and cool naturally to room temperature;

[0040] 3) The product obtained in 2) was centrifuged and washed 7 times with deionized water, and then lyophilized at minus 50°C for 24 hours to obtain a CNT / KMO composite fiber, whose X-ray diffraction pattern was as follows figure 1 , figure 1 It is shown that the obtained material is a birnessite-type manganese dioxide structure, and at the same time from its transmission electron microscope photo figure 2 It can be seen that the core-shell structure of CNT@KMO, in which the ...

Embodiment 2

[0044] 1) Spread the carbon nanotubes on the glass substrate, use oxygen plasma under the condition of 0.3torr and 50W, treat the surface of the carbon nanotubes in the air for 8 minutes, and obtain the surface-treated carbon nanotubes;

[0045] 2) Disperse 60 mg of surface-treated carbon nanotubes in 180 mL of 3 mg / mL potassium permanganate solution, stir at room temperature for 1 hour, transfer to four 100 mL hydrothermal reactors, react at 130 ° C for 6 hours, and then cool naturally to room temperature;

[0046] 3) The product obtained in 2) was centrifuged and washed 8 times with deionized water, and then lyophilized at minus 55°C for 20 hours to obtain CNT / KMO composite fibers;

[0047] 4) Disperse 10mg of highly conductive graphene (thickness<3nm) in ethanol and terpineol mixed solution of 30mL 0.67mg / mL ethylcellulose (EC), the volume ratio of ethanol and terpineol is 20: 1. Then add 40 mg of CNT / KMO composite fiber, stir for 0.5 hours, place in an oil bath at 95°C, s...

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Abstract

The invention discloses a carbon nanotube / birnessite / graphene composite positive electrode material with a hierarchical structure, a preparation method and application. The inner layer of the material is a carbon nanotube, the middle layer is birnessite layered nanosheets grown on the surface of the carbon nanotube in an array shape, and the outermost layer is high-conductivity graphene. The method comprises the following steps: uniformly dispersing surface-treated carbon nanotubes in a potassium permanganate aqueous solution to obtain dispersion liquid, carrying out hydrothermal treatment on the dispersion liquid, washing the product, freeze-drying the precipitate, dispersing high-conductivity graphene and the obtained carbon nanotube / birnessite composite fiber in a mixed solution of ethyl cellulose, ethanol and terpilenol; then removing ethanol in an obtained mixed system, blade-coating the formed ink on a substrate, performing vacuum drying, and finally removing the ethyl cellulose to obtain the carbon nanotube / birnessite / graphene composite positive electrode material with high capacity, high magnification and long cycle life.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for water-based zinc ion batteries, and specifically relates to a carbon nanotube / birnessite / graphene composite positive electrode material with a hierarchical structure, a preparation method and an application. Background technique [0002] At present, the urgent demand for the efficient utilization of renewable energy such as wind energy and solar energy has surged worldwide, and it is urgent to develop large-scale energy storage technology that matches it to realize the reasonable consumption of electric energy in the transmission and distribution network. For large-scale energy storage, the core requirements are low cost, high safety, long life and high energy storage density. Among the existing technical solutions, battery technology based on electrochemical energy storage is considered to be the most competitive option due to its advantages of high energy storage density, flexible...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/36
CPCH01M4/366H01M4/50H01M4/625H01M10/36H01M2004/028Y02E60/10
Inventor 王国隆李磊王亚玲王伟
Owner XI AN JIAOTONG UNIV
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