Preparation method of electrode materials for lithium batteries

Abstract

A preparation method of electrode materials for lithium batteries comprises the following steps: providing iron salt and a phosphorus source and dissolving the iron salt and the phosphorus source into a solvent to form mixed liquid; adding a plurality of micro particle packing into the mixed liquid, uniform mixing the plurality of micro particle with the mixed liquid, and 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 an iron phosphate precursor particles; providing lithium source solution and a reducing agent and mixingthe lithium source solution and the reducing agent with the iron phosphate precursor particle uniformly to form mixed slurry; and drying and heating the mixed slurry.

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 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, the diffusion path of lithium ions is mainly reduced by refining the particle size of lithium iron phosphate. The sol-gel method an...

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Problems solved by technology

However, since the intercalation and extraction of lithium ions is carried out in one-dimensional direction, the ionic conductivity, high rate charge and discharge performance and low temperature performance are poor.

[0003] In the prior art, in order to improve the shortcomings of poor lithium ion diffusion performance of lithium iron phosphate electrode materials, the diffusion path of lithium ions is mainly reduced by refining the particle size of lithium iron phosphate.

The sol-gel method and the co-precipitation method are commonly used methods for refining the particle size of lithium iron phosphate. These two methods can make the particle size of the lithium iron phosphate reach the nanoscale. However, the whole process of the synthesis of lithium iron phosphate by the sol-gel method It takes a long time, usually a few days or weeks, and it is not easy to realize industrialization, but it is easier to industrialize by co-precipitation method, but the formed lithium iron phosphate particles are easy to agglomerate

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