A kind of preparation method of three-dimensional network ammonium vanadate nanocrystal

Abstract

The invention discloses a preparation method of three-dimensional reticular ammonium vanadate nanometer crystals. The method comprises the following steps of uniformly dissolving NH4VO3 into ethylene glycol to obtain NH4VO3 solution with the NH4<+> concentration being 0.01 to 0.1 mol / L; using HCl solution for regulating the pH of the NH4VO3 solution to be 1 to 3.5; then, performing reaction for 0.5 to 2h in the ultrasonic environment to obtain a solution A; putting the solution A into a reaction kettle with an inner liner being polytetrafluoroethylene; installing the reaction kettle into homogeneous hydrothermal reaction; performing reaction for 4 to 8h at 160 to 200 DEG C; obtaining suspension liquid in the reaction kettle; performing centrifugation separation on the suspension liquid to obtain a powder product; using deionized water and absolute ethyl alcohol for alternately cleaning the powder product; then, drying the cleaned product to obtain the three-dimensional reticular NH4V3O8 nanometer crystals. The three-dimensional reticular ammonium vanadate nanometer crystals prepared by the method are used as a positive electrode material of the lithium battery, and have the characteristics that good electrochemical performance, great multiplying power and good performance. The method has the advantages that the process is simple; the chemical composition of the product is uniform.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and relates to a preparation method of a three-dimensional network ammonium vanadate nanocrystal. Background technique [0002] Since the beginning of human civilization, the development, utilization and storage of energy have been closely related to human life style and quality of life. The long-term use of fossil fuels increases the greenhouse effect of the earth, exacerbates the deterioration of the environment, and poses a great threat to the living environment of human beings. In order to make full use of natural energy, such as wind energy, tidal energy, solar energy, etc., it is necessary to have a suitable energy storage device, so the recyclable secondary battery, as a medium that can effectively store energy, realizes chemical energy and electrical energy. mutual conversion. With the development of secondary batteries, lithium-ion batterie...

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Problems solved by technology

[0004] Pure phase NH is currently prepared 4 V 3 o 8 There are mainly precipitation method, hydrothermal method, solvothermal method and sol-gel method. As long as the prepared morphology is one-dimensional nanorods, nanobelts, nanowires and two-dimensional sheet morphology, these materials with unique structures are effective. Raised NH 4 V 3 o 8 electrochemical performance, but NH 4 V 3 o 8 There are relatively few reports on the three-dimensional network morphology of nanomaterials. Compared with low-dimensional materials, the three-dimensional network morphology can promote the contact area with the electrolyte and accelerate the transmission rate of lithium ions and electrons.

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