Method for recovering active substance from PVDF-containing lithium iron phosphate positive electrode material

• Main Authors: WANG LEI, ZHAO SIJIA, LUO JIN'AI, XIAO CHAO, ZHANG QINJIAN, LI PAN, DENG HAILONG
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2021
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a method for recovering an active substance from a PVDF-containing lithium iron phosphate positive electrode material, and relates to the field of lithium ion batteries. The method for recovering the active substance from the PVDF-containing lithium iron phosphate positive electrode material comprises the steps of mixing raw materials including the PVDF-containing lithium iron phosphate positive electrode material and water, slurrying, adding a Fenton reagent, and carrying out a first reaction to obtain a first mixture; mixing the first mixture, water and sulfuric acid, and then carrying out second reaction to obtain a second mixture; and mixing the second mixture with ammonia water to carry out third reaction, and carrying out solid-liquid separation to obtain iron phosphate dihydrate and lithium-containing mother liquor. According to the method for recovering the active substance from the PVDF-containing lithium iron phosphate positive electrode material, the PVDF can be effectively d