Preparation method of porous structure ammonium vanadate material

Abstract

The invention provides a preparation method of a porous structure ammonium vanadate material. The preparation method comprises the following steps: dissolving ammonium metavanadate in deionized water so as to obtain a NH4VO3 solution A; adjusting the pH value of the solution A to 1.5-3.0, and then carrying out phonochemistry reaction so as to obtain a solution B; pouring the solution B into a reactor, enabling microwaves and an ultraviolet lamp to simultaneously act on the solution B, heating to 60-90 DEG C, preserving heat, and then naturally cooling to a room temperature; and carrying out centrifugal separation on suspension liquid in the reactor so as to obtain a powder product, washing and drying, thus obtaining the porous structure ammonium vanadate material. The NH4V3O8 microcrystal prepared by the method is uniform in chemical composition and relatively high in purity, is a special porous structure and has good electrochemistry performance when serving as an anode material for a lithium ion battery; the specific area of the material can be effectively enlarged. The preparation method is simple, low in reaction temperature, short in reaction time, environmentally-friendly and suitable for large-scale production; the follow-up treatment is not needed.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials of lithium ion batteries, and relates to a preparation method of positive electrode materials of lithium ion batteries, in particular to a preparation method of ammonium vanadate material with a porous structure. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life, good safety, and environmental protection. They have broad application prospects and are considered to be the energy storage materials with the most development potential in the market. [0003] NH 4 V 3 o 8 It is a new type of lithium intercalation material, which has a layered structure and belongs to the monoclinic crystal system, P2 1 / m space group. in NH 4 V 3 o 8 structure, V 3 o 8 - Layers are tightly connected along the c-axis, NH 4 + It is between its layers, stabilizing its structure. NH with larger radius 4 + It...

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Problems solved by technology

[0005] The synthesis of ammonium vanadate by the above precipitation method needs to prepare gel first, and then reflux the mixed solution with urea at 80°C for one week, which has the disadvantages of difficult control of the reaction process, long reaction cycle, and side reactions. The hydrothermal synthesis of NH 4 V 3 o 8 Surfactants are required, and there are disadvantages of relatively high reaction temperature and long reaction time, so a simple, fast and easy-to-control synthetic NH 4 V 3 o 8 The method is of great significance to the research and development of high-performance lithium-ion battery cathode materials

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