Positive electrode material, power storage device, and method for producing lithium vanadium phosphate carbon composite

The use of carboxylic acids in the production of lithium vanadium phosphate carbon composite stabilizes the reduction reaction and facilitates the production of high-purity nanoparticles with improved cycle characteristics, addressing the complexity and cost issues of existing methods.

JP7763368B2Active Publication Date: 2025-10-31NIPPON CHEMICAL IND CO LTD
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Patent Information

Application Number
JP2025008280
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2024-07-26
Filing Date
2025-01-21
Publication Date
2025-10-31
Estimated Expiration
2045-01-21

AI Technical Summary

Technical Problem

Existing methods for producing lithium vanadium phosphate carbon composite are complex and costly, limiting its industrial application and the production of high-purity lithium vanadium phosphate nanoparticles for use in positive electrode materials with excellent cycle characteristics.

Method used

A method involving the use of carboxylic acids, such as citric acid, to stabilize the reduction reaction slurry and act as a chelating agent, followed by spray-drying and calcination, allows for the production of lithium vanadium phosphate carbon composite with high purity and specific carbon content, resulting in nanoparticles with depressions on the particle surface.

Benefits of technology

This method enables the production of a lithium vanadium phosphate carbon composite with high purity and excellent cycle characteristics, suitable for use in electricity storage devices, by simplifying the process and maintaining stability during handling.

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Abstract

To provide a method for industrially advantageously producing a lithium vanadium phosphate carbon composite which can also generate lithium vanadium phosphate nanoparticles and which contains lithium vanadium phosphate of high purity as determined by X-ray diffraction.SOLUTION: There is provided a method for producing a composite of lithium vanadium phosphate having a NASICON structure and carbon, the method comprising: a first step of adding vanadium pentoxide, phosphoric acid, and a first carboxylic acid to a water solvent and performing a reduction reaction of vanadium pentoxide to prepare a reduction reaction slurry; a second step of adding a second carboxylic acid to the reduction reaction slurry to prepare a reduction reaction preparation liquid; a third step of adding a lithium source to the reduction reaction preparation liquid to prepare a starting material mixed solution in the form of a solution; a fourth step of subjecting the starting material mixed solution to spray-drying to obtain a reaction precursor; and a fifth step of firing the reaction precursor at 500-1300°C in an inert gas atmosphere or a reducing atmosphere to obtain a lithium vanadium phosphate carbon composite.SELECTED DRAWING: Figure 4
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