Method for preparing vanadium pentoxide/graphene composite aerogel material

Abstract

The invention relates to a method for preparing a vanadium pentoxide / graphene composite aerogel material. The method comprises the following steps: firstly, evenly mixing vanadium pentoxide powder, benzyl alcohol and isopropyl alcohol, refluxing, condensing, and filtering to obtain vanadium pentoxide sol; evaporating and concentrating to obtain concentrated vanadium pentoxide sol; adding an aqueous dispersion of graphene oxide and a catalyst to the concentrated vanadium pentoxide gel; stirring and ageing, so as to obtain vanadium pentoxide / graphene composite wet gel; carrying out solvent replacement in replaced solvent; drying to obtain vanadium pentoxide / graphene composite aerogel; and carrying out thermal treatment, so as to obtain the vanadium pentoxide / graphene composite aerogel. Compared with the prior art, the method disclosed by the invention is simple and easy to achieve; and meanwhile, inorganic vanadium pentoxide powder is adopted as the raw material, so that the cost is relatively low; and popularization and application are facilitated; meanwhile, a metallic oxide is evenly compounded with graphene through in-situ growth; and a new way is provided for the preparation of metallic oxide / graphene composite aerogel.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a vanadium pentoxide / graphene composite airgel material. Background technique [0002] With the rapid development of economy and society and the continuous improvement of people's living standards, environmental pollution, climate change and energy crisis have become important issues in China and the world today. In order to reduce the use of fossil energy, countries around the world are actively developing clean, sustainable and renewable energy such as solar energy, wind energy and tidal energy. New energy is usually converted into electrical energy for storage and transportation, and batteries and electrochemical capacitors have become the focus of attention as the most important electrical energy storage devices. [0003] As a traditional energy storage device, batteries have been widely developed and applied, and play an importan...

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Problems solved by technology

As disclosed in the above patent, the current V 2 o 5 The vast majority of aerogels are prepared by using organic vanadium salts or vanadium alkoxides as precursors. The raw materials must be imported, and the cost is very high, and V cannot be fully utilized. 2 o 5 Due to the advantage of low price, the preparation of vanadium oxide airgel with inorganic vanadium source as precursor has important application value

[0006] However a single V 2 o 5 The conductivity of airgel is poor, the internal resistance of the capacitor is large, and the V 2 o 5 The change of the structure leads to a decrease in the specific capacitance, which affects the overall performance of the capacitor. The use of high-conductivity materials to compound it can effectively improve its conductivity and give full play to its high-capacity characteristics. At present, V 2 o 5 Combination with carbon materials has become a new research hotspot

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