Sodium vanadium fluorophosphate, preparation method and uses thereof

Abstract

The present invention provides a sodium vanadium fluorophosphate, a preparation method and uses thereof, wherein the molecular formula of the sodium vanadium fluorophosphate is Na3(VOxPO4)2F3-2x, x is more than or equal to 0 and is less than or equal to 1, the morphology is a spherical wool ball, loose hollow ball or nanoparticle aggregate, and the size is from nanometer to micron. The preparation method comprises: (1) dissolving a vanadium source in water to obtain a vanadium source solution; (2) adding a phosphorus source, a fluorine source and a sodium source to the vanadium source solution to obtain a reaction mixture; and (3) post-treating the obtained reaction mixture to obtain the sodium vanadium fluorophosphate. According to the present invention, the water is directly used as the solvent so as to provide the advantage of no pollution; the sodium vanadium fluorophosphates can be directly synthesized at the room temperature of 10-35 DEG C, such that the temperature is low, the reaction kinetics is rapid, and the large-scale preparation of the sodium vanadium fluorophosphates can be achieved; the morphology and the crystallinity of the sodium vanadium fluorophosphate can be adjusted; the pentavalent vanadium industrial product can be used as the vanadium source so as to substantially reduce the cost of the vanadium source; and the prepared material has good electrochemical properties, and is suitable for the sodium ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and relates to a vanadium sodium fluorophosphate salt Na 3 (VO x PO 4 ) 2 f 3-2x (0≤x≤1) and its preparation method and application, especially a kind of vanadium sodium salt of fluorophosphate Na 3 (VO x PO 4 ) 2 f 3-2x (0≤x≤1), its rapid preparation method at room temperature and its use. Background technique [0002] At present, the global power energy is still dominated by thermal power, supplemented by nuclear power and hydropower. In recent years, in order to cope with the energy crisis and alleviate the increasingly severe environmental pressure, renewable energy has been developed and utilized. Research and development of efficient and cheap large-scale energy storage technology has become a key link in the sustainable development of electric energy and an important part of the country's future energy strategy. An electrochemical energy storage system with an energy...

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Problems solved by technology

In 2010, Jiangqing zhao and others proposed the sol-gel method to prepare sodium vanadium phosphate. Although the process is simple, the heat treatment temperature is as high as 800°C

CN103594716A discloses the preparation of NaVPO by sol-gel assisted two-stage high-temperature solid-phase method 4 F, but its process is complex, requires two calcinations, the calcination temperature is as high as 850 ° C, and has high requirements for the solubility of raw materials, so it is difficult to achieve large-scale production

CN 102509789A discloses the synthesis of Na 3 (VOxPO 4 ) 2 f 3-2x (0≤x≤1), although only one-step synthesis is required, the ball milling time is long, the temperature of the high-temperature solid-state reaction process is as high as 450-1000 ° C, the roasting time is long, and the synthesis process is relatively complicated

CN102306771A discloses a method for preparing a positive electrode material of sodium vanadium fluorophosphate, which uses two calcinations, the calcination temperature is as high as 750°C, and the energy consumption is large, which inevitably limits large-scale industrial production

This patent also involves the preparation of target materials by standing at room temperature for a long time, but the reaction kinetics needs to be further improved

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