Preparation method of zirconium, barium activated lithium iron phosphate anode material

Abstract

The invention provides a preparation method of a zirconium, barium activated lithium iron phosphate anode material, characterized in that: raw materials of lithium source, iron source, phosphate radial source, zirconium source and barium source are mixed according to the proportion of 1mol Li:0.00002-00005mol Zr:0.0003-0.003mol Ba:1mol Fe:1mol P, ball-milled for 20h in absolute ethyl alcohol medium at high rotation speed of 200r / minn and then dried at 105-120 DEG C to obtain a precursor, the dried precursor is placed into a high-temperature furnace and calcined for 24h at high temperature of 500-750 DEG C in a common pure nitrogen atmosphere to obtain the zirconium, barium activated lithium iron phosphate anode material. Because the zirconium, barium activated lithium iron phosphate anode material is doped with a small amount of zirconium, barium, the shape and particle diameter of the products are controlled, the stable lithium iron phosphate compound is obtained, the crystal lattice is activated, the diffusion coefficient of the lithium ion is increased and the first discharge capacity of the material reaches 160.52mAh / g; the electric potential of a discharge and charge platform is about 3.5V relative to the lithium electrode, the first discharge capacity exceeds 168mAh / g, the capacity attenuates by about 1.2% after 100 times of charge and discharge cycle. Compared with the non-doped LiFePO4 contrast embodiment, the capacity and the cycle stability of the doped LiFePO4 are relatively greatly improved.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of zirconium and barium activated lithium iron phosphate, which belongs to a method for preparing a positive electrode material of a lithium battery, and in particular relates to a method for preparing a positive electrode material for a lithium iron phosphate battery. Background technique [0002] At present, the research status of lithium iron phosphate doping modification: lithium iron phosphate LiFePO4 is non-toxic, environmentally friendly, high in safety, rich in raw materials, high in specific capacity, stable in cycle performance, and low in price. The stable discharge platform with a theoretical capacity of 3.5V, the lithium iron phosphate material has high energy density, low price, and excellent safety, and is especially suitable for power batteries. But it has a higher resistivity. Due to lithium iron phosphate, the kinetics of LiFePO4 is not good at room tempera...

AI Technical Summary

Problems solved by technology

[0005] At present, there is a consensus that lithium iron phosphate has the advantages of good safety, no pollution, stable cycle performance, high specific capacity and low price, but it also has poor conductivity and the disadvantage of lower tap density