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Preparation method of composite electrode material

A composite electrode and mixed solution technology, applied in the field of materials, can solve the problems of limited application prospects, high cost of electrode material preparation, high cost of carbon nanotubes and graphene, etc., to achieve simple process flow, improve electrochemical performance, and increase pseudocapacitance effect of effect

Active Publication Date: 2021-05-25
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the relatively high cost of preparing carbon nanotubes and graphene with better performance, and the MoS used 2 Most of them are synthesized through multi-step reactions, which makes the preparation cost of electrode materials relatively high and the application prospects are limited to a certain extent.

Method used

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  • Preparation method of composite electrode material
  • Preparation method of composite electrode material
  • Preparation method of composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] At an ambient temperature of 25°C, the bulkMoS 2 The powder and the surface dispersant sodium cholate were added into the ball mill tank at a mass ratio of 1:2, and ball milled at a speed of 150r / min for 3h. Then the ball-milled mixture was washed with a small amount of deionized water and centrifuged at 6000r / min for 30min to separate the unexfoliated MoS 2 , take out the supernatant to get MoS 2 nanosheet dispersion. At the same time, take 400mg PAN and add it to 2ml deionized water and 3g ZnCl 2 In a beaker, stir until completely dissolved. Then the resulting MoS 2 Nanosheet dispersion and ZnCl 2 Solution dissolved PAN mixed (MoS 2 The mass ratio to PAN is 3:100), stirred at a speed of 300r / min to make it evenly mixed to obtain PAN / MoS 2nanosheet composites. The composite was heated to 220 °C at a heating rate of 5 °C / min in air atmosphere, and kept for 1 h for pre-oxidation treatment. Subsequently, the product was heated to 800 °C for 2 h at a heating rate ...

Embodiment 2

[0040] At an ambient temperature of 20°C, the bulk MoS 2 The powder and the surface dispersant sodium cholate were added into the ball mill tank at a mass ratio of 1:3, and ball milled at a speed of 150r / min for 3h. Then the ball-milled mixture was washed with a small amount of deionized water and centrifuged at 6000r / min for 30min to separate the unexfoliated MoS 2 , take out the supernatant to get MoS 2 nanosheet dispersion. At the same time, take 400mg PAN and add it to 2ml deionized water and 3g ZnCl 2 In a beaker, stir until completely dissolved. Then the resulting MoS 2 Nanosheet dispersion and ZnCl 2 Solution dissolved PAN mixed (MoS 2 The mass ratio to PAN is 4.5:100), stirred at a speed of 300r / min to make it evenly mixed to obtain PAN / MoS 2 nanosheet composites. The composite was heated to 200°C at a heating rate of 5°C / min in an air atmosphere, and kept for 1h for pre-oxidation treatment. Then the product was heated to 800 °C at a heating rate of 5 °C / min u...

Embodiment 3

[0042] At an ambient temperature of 15°C, the bulk MoS 2 The powder and the surface dispersant sodium cholate were added into the ball mill tank at a mass ratio of 1:2, and ball milled at a speed of 150r / min for 3h. Then the ball-milled mixture was washed with a small amount of deionized water and centrifuged at 6000r / min for 30min to separate the unexfoliated MoS 2 , take out the supernatant to get MoS 2 nanosheet dispersion. At the same time, take 400mg PAN and add it to a mixture containing 2ml deionized water and 4g ZnCl 2 In a beaker, stir until completely dissolved. Then the resulting MoS 2 Nanosheet dispersion and ZnCl 2 Solution dissolved PAN mixed (MoS 2 The mass ratio to PAN is 6:100), stirred at a speed of 300r / min to make it evenly mixed to obtain PAN / MoS 2 nanosheet composites. The composite was pre-oxidized by heating to 220°C at a heating rate of 5°C / min in an air atmosphere and holding it for 1h. Subsequently, the product was heated to 700 °C for 2 h a...

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Abstract

The invention discloses a preparation method of a composite electrode material, and the method comprises the following steps: fully mixing a MoS2 nanosheet dispersion liquid with a ZnCl2 solution of PAN to form a uniformly dispersed and precipitate-free PAN / MoS2 mixed liquid; and heating and pre-oxidizing the obtained mixed solution in the air, and then carrying out high-temperature carbonization, washing and drying in an inert atmosphere to obtain the PAN-derived porous carbon / MoS2 composite electrode material. According to the preparation method, the MoS2 nanosheets are loaded into polyacrylonitrile, a precursor PAN molecular chain is regularly arranged due to the template effect of the MoS2 nanosheets, then the precursor PAN molecular chain is carbonized to form a graphite-like layered structure, and a hierarchical pore structure is formed while the conductivity is increased. In addition, molybdenum disulfide has relatively high theoretical specific capacitance, so that after the molybdenum disulfide is combined with the carbon material, the effective specific surface area can be increased, and meanwhile, the pseudocapacitance effect of the molybdenum disulfide is also improved, and the overall electrochemical performance of the material is better improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a composite electrode material. Background technique [0002] As a new energy storage device between traditional capacitors and chemical batteries, supercapacitors have attracted widespread attention due to their advantages such as high energy density, fast charge and discharge speed, and long cycle life. Compared with lithium-ion batteries, the production cost of supercapacitors is low, the safety is good, and the preparation process is green and pollution-free. The main factors affecting the electrochemical performance of supercapacitor electrode materials are specific surface area, pore size distribution, conductivity, etc. The large specific surface area and suitable hierarchical pore structure are conducive to the storage and diffusion transfer of a large number of ions, so that the material exhibits good electrochemical performance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/32H01G11/30H01G11/86
CPCH01G11/26H01G11/32H01G11/30H01G11/86
Inventor 刘刚王顺杰冯涛王研铭华英楠焦翼飞
Owner WUHAN INSTITUTE OF TECHNOLOGY
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