Vanadium-doped lithium iron phosphate positive electrode material as well as preparation method and application thereof

By doping lithium iron phosphate cathode material with vanadium, LiFePVxO4 material was prepared, which solved the problems of poor electronic conductivity and lithium ion diffusion, improved the electrochemical performance and rate performance of the material, and made it suitable for large-scale production.

CN122436487APending Publication Date: 2026-07-21HENAN LONGBAI NEW MATERIAL TECH CO LTD +1
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Patent Information

Application Number
CN202510081636.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-20
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The poor electronic conductivity and lithium-ion diffusion of lithium iron phosphate cathode materials result in poor rate performance.

Method used

LiFePVxO4 material was prepared by doping lithium iron phosphate cathode material with vanadium. The preparation method included slurry preparation, sand milling, spray drying and sintering. The particle size and doping amount were controlled to improve the conductivity and lithium ion diffusion rate of the material.

Benefits of technology

It improves the conductivity and rate performance of lithium iron phosphate cathode materials, enhances the electrochemical performance of the materials, makes them suitable for large-scale production, and utilizes waste materials from the production process to improve the material morphology and particle size distribution.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a vanadium-doped lithium iron phosphate positive electrode material and a preparation method and application thereof. The chemical formula of the positive electrode material is LiFePVxO4, x is more than or equal to 0.0001 and less than or equal to 0.01, metal vanadium is doped to replace a lithium site, D50 of the positive electrode material is 0.9-2 microns, and the specific surface area is 10-10.5 m < 2 > / g. The preparation method comprises the following steps: (1) putting a lithium source, iron phosphate, a carbon source, a vanadium source, a surfactant and a lithium iron phosphate waste material into water to prepare slurry; (2) feeding the slurry into a sand mill for sanding; (3) carrying out spray drying on the sanded slurry; (4) sintering the powder after spray drying; and (5) performing steel mill crushing on the sintered powder to obtain the lithium iron phosphate positive electrode material. Vanadium element doping is carried out on the lithium iron phosphate positive electrode material, so that the conductivity of a lithium iron phosphate product is improved, battery polarization is reduced, and the rate capability of the battery is improved.
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