Vanadium pentoxide (V2O5) material with large specific surface area and preparation method thereof

Abstract

The invention relates to a vanadium pentoxide (V2O5) material with a large specific surface area and a preparation method thereof. The V2O5 material is formed by irregularly cross connecting a plurality of tubular nanometer crystals; a tube wall of each tubular nanometer crystal is formed by mutually connecting single crystal particles; and holes exist among the particles. The preparation method of the material comprises the following steps of: adopting a chemical vapor deposition method; using a CVD (Chemical Vapor Deposition) preparation system; taking vanadyl acetylacetonate (VO (acac) 2) as a raw material; putting into an evaporator; and reacting steam formed by the evaporator with oxygen in carrier gas under a certain temperature to synthesize a V2O5 porous nanometer structure. The advantages are that: the V2O5 material has the large specific surface area, and has good circularity, quick Li ion electrochemical kinetics action and large storage capacity as a Li battery cathode material; and the synthesization process is simple, the purity of the material is high, the yield is large, the energy consumption is low, and the V2O5 material is suitable for being industrially produced in large scale and has good application prospect.

Description

technical field [0001] The present invention relates to related materials such as energy sources, catalysts, sensors, etc., in particular to a V 2 O 5 Materials and methods for their preparation. Background technique [0002] Vanadium oxides are a class of compounds VO, V 2 O 3 , VO 2 , V 2 O 5 , V n O 2n-1 , V 2n O 5n-2 general name. where V 2 O 5 It is the most stable in the vanadium oxide family, because it has a special layered structure, and the interaction force between layers is very weak, which provides a channel for the insertion and precipitation of many organic and inorganic molecules or ions. Aspects such as chemical sensing, catalysis, Li battery cathode materials have a wide range of applications. As a Li battery cathode material, V 2 O 5 The theoretical capacity of up to 294mA h g -1 , higher than LiFePO 4 (170mA h g -1 ), LiCoO 2 (274mA h g -1 ) and LiMnO 2 (285mA h g -1 ), so it is an ideal cathode material for Li batteries. But as a ...

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Problems solved by technology

These methods are difficult to get V in one step 2 o 5 Porous nanostructures, to get V 2 o 5 Porous nanostructures often have to go through some follow-up processes, such as high-temperature calcination, so they have the disadvantages of complex process and high energy consumption.

And the V prepared by these methods 2 o 5 Nanostructures often contain a certain amount of impurities of other vanadium oxides, which will also cause the decline and instability of their electrochemical performance.

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