Manufacturing method of ferric oxide anode active material for lithium secondary battery and manufacturing method of the lithium secondary battery

摘要

The present invention relates to a manufacturing method of ferric oxide negative electrode active materials for a lithium secondary battery, which comprises steps of putting a mixture solution of ferrous salt, lithium acetate and an organic solution in a reactor whose inside is sealed and covering the reactor with a lid; making the temperature of the reactor increase to the boiling point of the organic solution or a target reaction temperature which is higher than the boiling point of the organic solution by heating the sealed reactor; making the ferrous salt react with the lithium acetate by maintaining the temperature of the reactor in the target reaction temperature, thereby generating the nucleus of -Fe_2O_3 where acetate particles are adsorbed to Fe ions and accordingly the growth of -Fe_2O_3 particle is inhibited, thereby forming -Fe_2O_3 and settling the same on the bottom surface in the reactor by difference of specific gravity; selectively separating sediment settled on the bottom surface in the reactor; and obtaining -Fe_2O_3 negative electrode active materials by cleaning and drying the sediment selectively separated wherein the -Fe_2O_3 negative electrode active material is a circular structure or a hexahedron structure and is porous by having multiple porosities whose diameters are 1 and 10 nm distributed on the surface or bulk wherein the average diameter of the porosity is between 20 and 200 nm, and to a manufacturing method of a lithium secondary battery using the same.