Method for preparing granularity-adjustable lithium iron phosphate positive electrode material

Abstract

The invention relates to a method for preparing a granularity-adjustable lithium iron phosphate positive electrode material, and belongs to the field of lithium batteries. The preparation of the lithium iron phosphate material with adjustable and controllable granularity is realized. In order to achieve the purpose, the technical scheme is adopted. The method for preparing the granularity-adjustable lithium iron phosphate positive electrode material comprises the following steps: 1) preparing slurry; 2) drying the slurry; 3) sintering at high temperature; and 4) crushing and sieving. The method has the advantages that 1, the iron content and the phosphorus content of the iron phosphate raw material determine the element structure and the vacancy number in the crystal structure, and the iron phosphate with slightly low molar ratio of the iron content to the phosphorus content has higher reaction activity; 2, particle size control of iron phosphate and other raw materials before high-temperature treatment ensures consistent morphology of the initial raw materials, and reaction uniformity is improved; 3, the particle size obtained after atomization drying is matched with the proper sintering temperature to guarantee the sintering completion degree, and preparation of the lithium iron phosphate material with the adjustable particle size is achieved.

Description

technical field [0001] The invention relates to a method for preparing a lithium iron phosphate cathode material with adjustable particle size, belonging to the field of lithium batteries. Background technique [0002] The crystal structure of lithium iron phosphate (LiFePO4) is an olivine-type orthorhombic structure, the space group is Pnmb, and the unit cell size is: a=0.6008 nm, b=1.0334 nm, c=0.4693 nm. Lithium iron phosphate cathode material has been paid close attention to by the lithium battery and new energy industries because of its good safety performance and high theoretical specific capacity, especially in the field of new energy vehicles that pursue high capacity density. Lithium iron phosphate has excellent safety performance is irreplaceable. Compared with high-nickel ternary materials with high specific capacity and low safety performance, lithium iron phosphate materials are being more and more applied to power supplies. At the end of lithium iron phosphat...

AI Technical Summary

Problems solved by technology

The purpose is to improve energy density, electrical conductivity and bulk density, but it is obvious that the method only stays in the reasonable control of macro indicators

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