Method for repairing and regenerating lithium iron phosphate positive electrode material

• Main Authors: LONG FEN, ZHOU WENBIN, NING PEICHAO, ZHOU YOU, NGUYEN DINH SAN, LI CHANGDONG
• Format: Patent
• Language: Chinese; English
• Published: 02.05.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a method for repairing and regenerating a lithium iron phosphate positive electrode material, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: firstly, partially oxidizing a lithium iron phosphate positive electrode material obtained by stripping a lithium iron phosphate waste pole piece, and then reducing the oxidized lithium iron phosphate at high temperature by utilizing redundant carbon in the lithium iron phosphate positive electrode material to obtain the carbon-removed, repaired and regenerated lithium iron phosphate positive electrode material. Part of the lithium iron phosphate positive electrode material is oxidized by controlling the oxidation degree, and then the oxidized lithium iron phosphate is reduced at a high temperature by using redundant carbon in the lithium iron phosphate positive electrode material, so that the aim of removing carbon is fulfilled, the pure lithium iron phosphate positive electrode material is