Preparation method and application of lithium iron phosphate positive electrode material

Abstract

The invention belongs to the technical field of lithium ion battery material preparation, and provides a preparation method and application of a lithium iron phosphate positive electrode material, and the preparation method comprises the following steps: (1) mixing and refining an iron source, a phosphorus source, a lithium source, a carbon source and an additive by a dry method to obtain a mixed material; (2) sintering the mixed material for the first time, and then crushing to obtain a crushed material; and (3) sintering the crushed material for the second time, introducing a gasifiable organic carbon source during sintering, and then cooling to obtain the lithium iron phosphate positive electrode material. According to the invention, high-efficiency mixing equipment is used for carrying out one-step mixing refining, sintering and crushing on the raw materials, then secondary sintering is carried out, and a gasifiable organic carbon source is used for supplementing carbon coating, so that the material has better carbon coating layer and particle morphology, the obtained product has better performance, the performance is greatly improved compared with the same type of products on the market, the cycling stability is good, and the general requirements of high-performance lithium iron phosphate batteries can be met.

Description

technical field

[0001] The invention relates to the technical field of preparation of lithium ion battery materials, in particular to a preparation method and application of a lithium iron phosphate cathode material. Background technique

[0002] Lithium-ion battery materials have seen the prospect of new energy in the new century due to their high capacity and renewable characteristics since their appearance. Lithium iron phosphate, as a high-safety, good-cycling, and environment-friendly positive electrode material, has always been a favored research object in the lithium battery industry. Its application fields involve various commercial vehicle batteries, energy storage base stations, and many electrical equipment, etc. . However, the disadvantage of lithium iron phosphate material itself is that the electronic conductivity and ionic conductivity are low, and it shows poor rate performance when used as a cathode material in lithium-ion batteries. Therefore, in order to...

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