Carbon-coated sodium vanadyl fluorophosphate as well as production method and application thereof

By adopting a production method of carbon-coated sodium vanadyl fluorophosphate at low temperatures, the problem that the prior art cannot improve the conductivity of sodium vanadyl fluorophosphate is solved, and high-performance preparation of materials and the performance improvement of sodium ion batteries are achieved.

CN119725496APending Publication Date: 2025-03-28DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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Patent Information

Application Number
CN202510000337.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The prior art cannot effectively improve the conductivity of sodium vanadyl fluorophosphate material at low temperatures, resulting in poor performance in sodium ion batteries.

Method used

A carbon-coated vanadium fluorophosphate production method is adopted, and carbon-coated vanadium fluorophosphate is prepared by mixing carbon-coated vanadium fluorophosphate, sodium fluoride, sodium source, phosphorus source and high-priced vanadium source in a specific molar ratio, and calcining it at a low temperature of 200-500°C.

Benefits of technology

The preparation of carbon-coated sodium vanadyl fluorophosphate at low temperatures is achieved, which improves the electronic conductivity of the material and enhances the charge and discharge capacity and cycle life of the sodium ion battery.

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Abstract

The invention provides carbon-coated sodium vanadyl fluorophosphate as well as a production method and application thereof.The production method of the carbon-coated sodium vanadyl fluorophosphate comprises the following steps: mixing carbon-coated vanadium phosphate, sodium fluoride, a sodium source, a phosphorus source and a high-valence vanadium source according to the molar ratio of Na: V: P: F being 3: 2: 2: 1, and ensuring that the average valence state of vanadium in the mixture is 3.5 valence; fully mixing and crushing the mixture by using a ball mill; the crushed mixture is calcined for 0.2-24 h at the low temperature of 200-500 DEG C, carbon-coated sodium vanadyl fluorophosphate is prepared, and the carbon content in the carbon-coated sodium vanadyl fluorophosphate is 0.1-10%. The production method of the carbon-coated sodium vanadyl fluorophosphate has the advantages that the steps are scientific and reasonable, the carbon-coated sodium vanadyl fluorophosphate can be prepared at low temperature, and the prepared carbon-coated sodium vanadyl fluorophosphate has higher charge-discharge capacity and longer cycle life.
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