Preparation method of lithium iron phosphate positive electrode material

• Main Authors: LIU DINGYI, YAN MING, REN MINGMING, SUN XUELEI, LI LIN, WU PENGSEN, WAN WENLIANG, KIM SUN-YONG, HUO QIANQIAN, MENG XIANGMING
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2024
• 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 relates to the technical field of preparation of lithium iron phosphate positive electrode materials of lithium ion batteries, in particular to a preparation method of a lithium iron phosphate positive electrode material. The method comprises the following steps: (a) carrying out grinding and solid-liquid separation on a first mixture containing an iron phosphate dehydrate raw material, a lithium source and a carbon source to obtain first slurry; adding water into the first slurry, and stirring to obtain second slurry; the water content of the iron phosphate dihydrate raw material is 5-70%; the solid content of the first slurry is 60%-90%; and (b) drying and calcining the second slurry. According to the method, the lithium iron phosphate positive electrode material is prepared by taking iron phosphate dihydrate containing a certain amount of water as a raw material, and grinding is performed by adopting a semi-dry method, so that the preparation process is saved, and the preparation cost is redu