Graphene/nickel composite material, preparation method thereof, electrode plate and capacitor

A composite material and graphene technology, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problem of low energy storage performance of graphene/nickel composite materials, achieve increased energy storage performance, improve energy storage performance, and prevent stacking Effect

Inactive Publication Date: 2014-03-26
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a kind of graphene / nickel composite material preparation method, solve the technical problem that the energy storage performance of the graphene / nickel composite material prepared by the prior art is not high; The graphene / nickel composite material , electrodes and capacitors

Method used

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preparation example Construction

[0017] The embodiment of the present invention provides a kind of graphene / nickel composite material preparation method, comprises the following steps:

[0018] Step S01, preparing graphite oxide;

[0019] Step S02, preparing graphene oxide / nickel composite material:

[0020] Adding the graphite oxide into water, adding nickel foam after ultrasonic treatment, and ultrasonic treatment for 1 to 5 hours again to obtain a graphene oxide / nickel composite material;

[0021] Step S03, preparing graphene / nickel composite material:

[0022] The graphene oxide / nickel composite material is annealed in an inert atmosphere at a temperature of 700-1000° C. to obtain a graphene / nickel composite material.

[0023] In step S01, the graphite oxide can be prepared by the following method:

[0024] Add graphite into a mixed solution composed of concentrated sulfuric acid and concentrated nitric acid, stir in an ice bath, add potassium permanganate to react for 1-2 hours, adjust the temperature...

Embodiment 1

[0043] The preparation method of the graphene / nickel composite material of the embodiment of the present invention comprises the following steps:

[0044] Graphite → graphite oxide → graphene oxide / nickel composite → graphene / nickel composite

[0045] Graphite: 99.5% purity;

[0046] 1. Preparation of graphite oxide:

[0047] Weigh 1g of graphite with a purity of 99.5%, add 90ml mass fraction of 98% concentrated sulfuric acid and 25ml mass fraction of 65% concentrated nitric acid to obtain a mixture, place the mixture in an ice-water mixing bath and stir React for 20 minutes, then slowly add 6g of potassium permanganate to the mixture, stir for 1 hour, then heat the reaction temperature to 85°C and keep it for 30 minutes, then add 92ml of deionized water and keep it at 85°C for 30 minutes. After the reaction, add 10ml of 30% hydrogen peroxide solution to the reaction system, stir for 10 minutes, filter the mixture with suction, collect the solids, and then wash the solids wi...

Embodiment 2

[0053] The preparation method of the graphene / nickel composite material of the embodiment of the present invention comprises the following steps:

[0054] Graphite → graphite oxide → graphene oxide / nickel composite → graphene / nickel composite

[0055] Graphite: 99.5% purity;

[0056] 1. Preparation of graphite oxide:

[0057] Take 5g of graphite with a purity of 99.5%, and add it to a mixed solution consisting of 475ml mass fraction of 98% concentrated sulfuric acid and 120ml mass fraction of 65% concentrated nitric acid to obtain a mixture, which is placed in an ice-water mixing bath and stirred React for 25 minutes, then slowly add 20g of potassium permanganate to the mixture, stir for 1 hour, then heat the reaction temperature to 90°C and keep it for 30 minutes, then add 92ml of deionized water and keep it at 85°C for 30 minutes. After the reaction, add 30ml of 30% hydrogen peroxide solution to the reaction system, stir for 10 minutes, filter the mixture with suction, col...

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Abstract

The invention is applicable to the field of new materials and provides a graphene/nickel composite material, a preparation method thereof, an electrode plate and a capacitor. The preparation method comprises the steps of preparing graphite oxide, preparing a graphene oxide/nickel composite material, preparing the graphene/nickel composite material, and the like. In the preparation method of the graphene/nickel composite material, the graphene oxide and the foamed nickel are combined through an ultrasound mode to obtain the graphene/nickel composite material, so that the problems of lamination and agglomeration of the graphene oxide are effectively alleviated, and the energy storage property of the graphene/nickel composite material is also greatly improved. According to the preparation method of the graphene/nickel composite material, the graphene is uniformly adhered in a gap of the foamed nickel, so that the problems of lamination and agglomeration of the graphene are effectively prevented, and the energy storage property of the graphene is greatly improved.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a graphene / nickel composite material, a preparation method, an electrode sheet and a capacitor. Background technique [0002] Electrochemical capacitor is a new type of energy storage device, which has the advantages of fast charge and discharge rate, high power density, and long cycle life. It is another energy storage device with great application potential and development value after lithium-ion batteries. However, low energy density is a key factor restricting the development and application of capacitors. According to the calculation formula of energy density There are two main ways to increase the energy density. On the one hand, the voltage window of the capacitor is increased; on the other hand, the specific capacity of the electrode material is increased. Both of these improvements will lead to an increase in energy density. [0003] Graphene has excellent phy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
Inventor 周明杰王要兵钟辉袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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