Sodium vanadium fluorophosphate electrode material and coprecipitation preparation method thereof and application in positive electrode material

The preparation of sodium vanadium fluorogenic phosphate sodium electrode material was solved by co-precipitation method, which caused poor stability in the positive electrode material of sodium ion battery during the circulation process, and the regulation of material particle size and morphology was achieved, and the energy density and cycle stability of the battery were improved.

CN117832478BActive Publication Date: 2025-03-25QINGDAO UNIV OF SCI & TECH
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Patent Information

Application Number
CN202410013917.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-05
Publication Date
2025-03-25
Estimated Expiration
2044-01-05

AI Technical Summary

Technical Problem

The existing sodium ion battery positive electrode materials have poor stability during the circulation process, and small particle size and irregular morphology lead to low energy density and poor tap density, which affects the improvement of electrochemical performance.

Method used

The co-precipitation method is used to prepare sodium vanadium fluorophosphate electrode material. By controlling the standstill time and the content and concentration of secondary addition, the particle size is adjusted to form a regular and uniform spherical structure, and the specific surface area and reaction kinetics of the material are improved.

Benefits of technology

It realizes effective regulation of the particle size and morphology of the material, improves the tap density and energy density of the material, and enhances the cycle stability and rate performance of the battery.

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Abstract

The present application provides a sodium vanadium fluorophosphate electrode material and a preparation method thereof and an application in a positive electrode material; wherein the preparation method adopts a coprecipitation preparation method; specifically: a sodium source, a phosphorus source and a fluorine source are mixed and stirred to dissolve to obtain a mixed solution A; a vanadium source is dissolved to obtain a solution B; the mixed solution A is dripped into the solution B at a uniform and slow speed, and is fully stirred while dripping, and a gray flocculent precipitate is produced at the moment of dripping, and a mixture C is formed after the dripping is completed; the above operation is repeated to obtain a mixture D; the mixture C is allowed to stand for a preset time at room temperature for standby use; the prepared mixture D is added to the mixture C after standing, after stirring and mixing, after standing for a preset time, centrifugation washing and drying, and the fixed product is placed in a tubular furnace for roasting to obtain a sodium vanadium fluorophosphate electrode material. By controlling the rate, content, concentration, etc. of the secondary addition, the particle size of NVPOF can be effectively and accurately controlled.
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