公开(公告)号：US09199850B2

公开(公告)日：2015-12-01

申请号：US13651765

申请日：2012-10-15

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyung Sun Kim ,  Byung Won Cho ,  Hwa Young Lee ,  Su Jin Kim ,  Eun Jung Shin ,  Kyung Yoon Chung

IPC: C01B25/00 ,  C01B25/37 ,  C01B25/45 ,  H01M4/1397 ,  H01M4/58 ,  H01B1/12 ,  H01M4/02 ,  H01M4/04 ,  H01M4/62

CPC classification number: C01B25/375 ,  C01B25/45 ,  H01M4/0471 ,  H01M4/1397 ,  H01M4/5825 ,  H01M4/625 ,  Y02E60/122

Abstract: 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.

Abstract translation: 本发明涉及通过再循环制造用于锂二次电池的LiFePO 4阴极电活性材料的方法，以及用于锂二次电池的LiFePO 4阴极电活性材料，LiFePO 4阴极和由此制造的锂二次电池。 本发明的特征在于，阴极废料在空气中进行热处理，以使阴极电活性物质容易地溶解在酸性溶液中，并将作为沉淀物获得的无定形FePO 4在空气或氢气气氛中进行热处理，以制造结晶 FePO4或Fe2P2O7。 根据本发明，阴极废料可以通过简单，环保且经济的方法再循环。 此外，通过使用来自阴极废料的LiFePO 4阴极电活性材料制造的锂二次电池在性能方面没有限制。