Method of fabricating LiFePO₄ cathode electroactive material by recycling, and LiFePO₄ cathode electroactive material, LiFePO₄ cathode, and lithium secondary battery fabricated thereby

摘要

The present invention relates to a method for fabricating a LiFePO4 cathode electroactive material for a lithium secondary battery by recycling, and a LiFePO4 cathode electroactive material for a lithium secondary battery, a LiFePO4 cathode, and a lithium secondary battery fabricated thereby. The present invention is characterized in that a cathode scrap is heat treated in air for a cathode electroactive material to be easily dissolved in an acidic solution, and amorphous FePO₄ obtained as precipitate is heat treated in an atmosphere of air or hydrogen so as to fabricate crystalline FePO₄ or Fe₂P₂O₇. According to the present invention, a cathode scrap may be recycled by using a simple, environmentally friendly, and economical method. Further, a lithium secondary battery fabricated by using a LiFePO₄ cathode electroactive material from the cathode scrap is not limited in terms of performance.