A preparation method for preparing graphene sheet-loaded nano-nickel composite powder by microwave expansion method
A technology of graphene sheet and microwave expansion, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem of low energy storage performance of graphene/nickel composite materials, and achieve the benefits of penetration and ions Effects of diffusion, prevention of lamination, and improvement of specific surface area
Active Publication Date: 2019-03-15
张娟
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Problems solved by technology
[0005] Aiming at the deficiencies of the prior art, the present invention provides a preparation method for preparing graphene sheet-loaded nano-nickel composite powder by microwave expansion method, which solves the problem that the energy storage performance of the graphene / nickel composite material prepared by the prior art is not high technical problem
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Experimental program
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Embodiment Construction
[0019] A preparation method for preparing graphene sheet-loaded nano-nickel composite powder by using a microwave expansion method, the preparation process of which is as follows:
[0020] (1) First, 18 parts by weight of nickel sulfate was prepared into a solution with a concentration of 0.5 mol / L, 0.3 parts of polyethylene glycol 1000 was added, and after continuous and uniform stirring, 4 parts of oxalic acid solution was added for precipitation reaction to generate a single precursor solution. Then use a constant pressure dropping funnel to slowly add 15 parts of 0.5mol / L zinc chloride solution and 3 parts of oxalic acid solution to the single precursor solution at the same time to generate a coating salt precursor solution;
[0021] (2) Weigh 45 parts of flake graphite and slowly add it to 180 parts of concentrated sulfuric acid, slowly add 70 parts of potassium permanganate under stirring conditions, stir intermittently for 2 hours at 35 °C water bath temperature, and was...
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Abstract
The invention discloses a method for preparing a graphene slice load nanometer nickel composite powder by a microwave expansion method. In the invention, potassium permanganate and concentrated sulfuric acid are used to oxidize intercalated natural flake graphite. Oxygen-containing groups such as hydroxyl groups, epoxy groups and carboxyl groups are introduced between graphite layers so as to increase the distance between the graphite layers. The distance between the graphite layers is further increased under the effect of a microwave field so as to increase the specific surface area of the graphene. After high-temperature sintering, zinc oxide / nickel powders are uniform attached to the gaps of the graphene slices. Then, the zinc oxide is removed by means of immersion in hydrochloric acid and rich pore structures are formed in the composite material. The pore structures are beneficial to the penetration of electrolyte and the diffusion of ions in an electrochemical energy storage device and improve ion conductivity during reaction.
Description
technical field [0001] The invention relates to the field of graphene composite materials, in particular to a preparation method for preparing graphene sheet-loaded nano-nickel composite powder by using a microwave expansion method. Background technique [0002] The development of clean and renewable energy is a major strategy for my country's social and economic development. In all levels of new energy technology, electrochemical energy storage plays an extremely important role, and it is also a hot issue in current scientific research. 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. [0003] However, low energy density is a key factor restricting the development and application of capacitors. According to the calculation formula of ener...
Claims
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IPC IPC(8): H01G11/86H01G11/24H01G11/36
CPCY02E60/13
Inventor 张娟
Owner 张娟