3D cross-linked coralloid nickle vanadate nanometer material and electrochemical application thereof

Abstract

The invention provides a preparation method of a 3D cross-linked coralloid nickle vanadate nanometer material. According to the method, a vanadium source and a nickle source are subjected to syntheticreaction in ionic liquid to obtain the 3D cross-linked coralloid nickle vanadate nanometer material with a specific surface area of 50-150 m<2> / g. The invention further provides application of the prepared 3D cross-linked coralloid nickle vanadate nanometer material; the prepared nickle vanadate nanometer material is calcined in an air atmosphere to obtain an active phase, and the active phase isapplied to a lithium ion battery as an electrode material. The nickle vanadate nanometer material prepared through the method is even in shape, 3D cross-linked and coralloid, the activity and the specific surface area of the nickle vanadate nanometer material are effectively improved, the specific surface area reaches 50-150 m<2> / g, the reaction is carried out at normal pressure, the preparationmethod of the 3D cross-linked coralloid nickle vanadate nanometer material has the characters of being simple and convenient to operate, and safe, the electrode material applied to the lithium ion battery shows high electrode specific capacity, and the molar specific capacity of an electrode is about 950-1400 mAh / g.

Description

technical field [0001] The invention belongs to the technical field of nickel vanadate nanomaterials, and in particular relates to a 3D crosslinked coral-shaped nickel vanadate nanomaterial and its electrochemical application. Background technique [0002] Nickel vanadate (NiVO) is an advantageous anode material for lithium-ion batteries, which has the advantages of high electrode specific capacity, low cost and environmental friendliness. At present, the main preparation method of nickel vanadate is to first prepare the precursor by precipitation method, hydrothermal synthesis method, solvothermal method or sol method, and then obtain the final active phase after calcination at 400 ° C ~ 500 ° C for electrochemical performance testing. . Sambandam et al. synthesized nickel vanadate MOF material in aqueous solution by precipitation method, and then roasted. After roasting, the crystal phase was Ni 3 V 2 o 8 , spherical particles with a morphology of 20nm to 50nm, which c...

AI Technical Summary

Problems solved by technology

It can be seen from the above that most of the nickel vanadate materials prepared by the current technology are irregular particles, spherical or other uneven bulk materials, and the morphology of nanowires is obtained by electrospinning technology, rather than the material itself. Assembled and synthesized, and the specific surface area of ​​the reported pure nickel vanadate materials is low (≤20m 2 / g), inhibiting its application in various aspects

In addition, the hydrothermal synthesis method requires a high-pressure environment, and there is a risk of operation; the sol method has the disadvantages of many steps and cumbersome operations

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