Lithium iron phosphate battery positive electrode material recovery method

• Main Authors: ZHONG FAPING, TAN SHUIFA, JIANG SUBIN, HE CHIHUAN, LIU HONGBING, ZHU JIQUN
• Format: Patent
• Language: Chinese; English
• Published: 06.02.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a lithium iron phosphate battery positive electrode material recovery method, which comprises: discharging and disassembling a waste lithium iron phosphate battery, crushing the disassembled lithium iron phosphate positive electrode sheet, carrying out high temperature treatment, uniformly mixing the high temperature treatment product with a carbon material and ammonium chloride, and carrying out high temperature roasting in an inert atmosphere to obtain the lithium iron phosphate battery positive electrode material. And sequentially carrying out metal porous membrane filtration and graded quenching condensation on the roasted gas-phase product, respectively recovering ferric chloride and aluminum chloride, leaching the roasted solid-phase product in water, filtering to obtain a lithium chloride aqueous solution, and adding a saturated sodium carbonate solution to precipitate to obtain lithium carbonate. The method has the advantages of being short in technological process, outstanding