Preparation method of electrode materials for lithium batteries

Abstract

A preparation method of electrode materials for lithium batteries comprises the following steps: providing a vanadium source, iron salt and a phosphorus source and dissolving the vanadium source, the iron salt and the phosphorus source into a solvent to form mixed liquid; regulating the pH value of the mixed liquid to be 1.5-5 during mixing to ensure the mixed liquid to react so as to form vanadium-doped iron phosphate precursor particles; providing lithium source solution and a reducing agent and mixing the lithium source solution and the vanadium-doped iron phosphate precursor particles with the reducing agent uniformly to form mixed slurry; and drying and heating the mixed stock, thus forming the vanadium-doped lithium iron phosphate electrode materials.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery electrode material, in particular to a preparation method of a vanadium-doped lithium iron phosphate electrode material. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) as a lithium battery electrode material has attracted much attention due to its stable structure, good safety, abundant resources, good high temperature performance and cycle performance, and high theoretical specific capacity. However, since the intercalation and extraction of lithium ions is carried out in one-dimensional direction, the ionic conductivity, high-rate charge-discharge performance and low-temperature performance are poor. [0003] In the prior art, in order to improve the disadvantage of poor lithium ion diffusion performance of lithium iron phosphate electrode materials, some people form vanadium-doped lithium iron phosphate electrode materials through solid-phase synthesis process, whe...

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Problems solved by technology

However, the method of uniformly mixing the solid-phase mixture by ball milling can only be simple mixing between solid-phase powders, and cannot achieve uniform mixing at the atomic level, resulting in that vanadium cannot be uniformly incorporated into the lithium iron phosphate battery. electrode material, thus ultimately affecting the electrochemical stability of the vanadium-doped lithium iron phosphate electrode material

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