Demagnetizing method and demagnetizing system for phosphate positive electrode material and lithium ion battery

• Main Authors: DU JINCAO, LIANG SHIHAN, XU RONGYI, LI YINENG
• Format: Patent
• Language: Chinese; English
• Published: 30.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS; SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; TRANSPORTING

The invention relates to the technical field of demagnetization of positive electrode materials, in particular to a demagnetization method and a demagnetization system of a phosphate positive electrode material and a lithium ion battery. The demagnetizing method of the phosphate positive electrode material comprises the following steps: calcining a precursor to obtain a phosphate positive electrode material, and carrying out jet milling treatment and grading treatment on the phosphate positive electrode material to obtain a first material; and carrying out discharging treatment and demagnetizing treatment on the first material, and collecting to obtain the demagnetized phosphate positive electrode material. The demagnetization method disclosed by the invention can effectively remove magnetic impurities of the phosphate positive electrode material, and is low in cost and simple; the battery prepared from the demagnetized phosphate positive electrode material is lower in self-discharge rate and excellent in cap