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Vertical graphene/manganese dioxide composite material as well as preparation method and application thereof

A technology of manganese dioxide and composite materials, applied in nanotechnology for materials and surface science, secondary batteries, electrochemical generators, etc., can solve the problems of accelerated reaction rate, poor rate performance, poor conductivity, etc., to achieve Effects of high conductivity, high rate performance, and excellent flexibility

Inactive Publication Date: 2020-04-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a vertical graphene / manganese dioxide composite material and its preparation method and its application as a positive electrode material for zinc ion batteries, aiming at the poor conductivity and poor rate performance of the current electrode materials of zinc ion batteries. The composite material has the advantages of high electrical conductivity, inhibiting the collapse of the manganese dioxide structure, and accelerating the reaction rate.

Method used

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  • Vertical graphene/manganese dioxide composite material as well as preparation method and application thereof
  • Vertical graphene/manganese dioxide composite material as well as preparation method and application thereof
  • Vertical graphene/manganese dioxide composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] After the carbon cloth base material is activated with concentrated sulfuric acid, the conditions for the activation of concentrated sulfuric acid are: the temperature is 70°C, the concentration of concentrated sulfuric acid is 5mol / L, and the activation time is 120 minutes, and then it is washed several times with deionized water and ethanol to obtain the preliminary Treated carbon cloth substrate.

[0026] The pretreated carbon cloth substrate was placed in a tube furnace and evacuated so that the system pressure reached 10 mTorr. Then the temperature was raised to 450°C, and plasma was generated when the microwave power reached 550W under hydrogen atmosphere. After the carbon cloth was treated with plasma, it was heated to 750°C for 1 hour under the atmosphere of methane and hydrogen (volume ratio: 5:1), and the vertical graphene material grown on the carbon cloth substrate was obtained. Scanning electron microscope (SEM) and transmission electron microscope (TEM) a...

Embodiment 2

[0029] After the carbon cloth base material is activated with concentrated sulfuric acid, the conditions for the activation of concentrated sulfuric acid are: the temperature is 80°C, the concentration of concentrated sulfuric acid is 8mol / L, and the activation time is 90 minutes, and then it is washed several times with deionized water and ethanol to obtain the preliminary Treated carbon cloth substrate.

[0030] The pretreated carbon cloth substrate was placed in a tube furnace and evacuated so that the system pressure reached 10 mTorr. Then the temperature was raised to 500°C, and plasma was generated when the microwave power reached 600W under hydrogen atmosphere. After the carbon cloth was treated with plasma, the temperature was raised to 800°C for 1.5 hours under the atmosphere of methane and hydrogen (10:1 volume ratio), and the vertical graphene material grown on the carbon cloth substrate was obtained.

[0031] Weigh 7.9g of potassium permanganate and dissolve it in...

Embodiment 3

[0033] After the carbon cloth base material is activated with concentrated sulfuric acid, the conditions for the activation of concentrated sulfuric acid are: the temperature is 90°C, the concentration of concentrated sulfuric acid is 10mol / L, the activation time is 60 minutes, and then washed several times with deionized water and ethanol to obtain the pre- Treated carbon cloth substrate.

[0034]The pretreated carbon cloth substrate was placed in a tube furnace and evacuated so that the system pressure reached 10 mTorr. Then the temperature was raised to 550°C, and plasma was generated when the microwave power reached 650W under hydrogen atmosphere. After the carbon cloth was treated with plasma, the temperature was raised to 850°C for 2 hours under the atmosphere of methane and hydrogen (15:1 volume ratio), and the vertical graphene material grown on the carbon cloth substrate was obtained.

[0035] Weigh 15.8g of potassium permanganate and dissolve it in 1000ml of deioniz...

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Abstract

The invention discloses a vertical graphene / manganese dioxide composite material, a preparation method of the vertical graphene / manganese dioxide composite material and an application of the verticalgraphene / manganese dioxide composite material as a positive electrode material of a zinc ion battery. The method comprises the steps of reacting for 1-2 hours at the temperature of 750-850 DEG C to generate a carbon cloth loaded vertical graphene sheet according to a microwave plasma chemical vapor deposition method; through a hydrothermal method, taking potassium permanganate and water as reaction sources, reacting for 1-6 hours at the temperature of 120-160 DEG C, taking out and drying to obtain the vertical graphene / manganese dioxide composite material, and uniformly loading the manganese dioxide nanosheets on the surface of the vertical graphene to form a core-shell structure. The vertical graphene / manganese dioxide composite material provided by the invention has high specific capacitance, high rate capability and long cycle life, and has the wide application prospects in the fields of mobile communication, electric vehicles, aerospace and the like.

Description

technical field [0001] The invention relates to the field of positive electrode materials for zinc ion batteries, in particular to a vertical graphene / manganese dioxide composite material, a preparation method thereof, and an application as a positive electrode material for zinc ion batteries. Background technique [0002] At present, lithium-ion batteries occupy the largest commercial market and have been widely used in fields such as electric vehicles and mobile communications. However, lithium metal resources are limited and expensive. At the same time, the harsh conditions in which batteries must be fabricated in an anhydrous environment make their production costly. In addition, the organic electrolyte used in lithium-ion batteries is usually toxic and flammable, posing safety hazards. The ionic conductivity of aqueous electrolytes is 2 orders of magnitude higher than that of organic electrolytes, so aqueous batteries generally have higher power densities, and are eas...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/50H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 夏新辉张燕邓盛珏王秀丽涂江平
Owner ZHEJIANG UNIV
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