Preparation method of high-compaction type lithium iron manganese phosphate positive electrode material

• Main Authors: TONG GONGSONG, LI ZHI, LIANG FUZHONG, DENG ZIZHAO
• Format: Patent
• Language: Chinese; English
• Published: 16.07.2024
• 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 discloses a preparation method of a high-compaction type lithium manganese iron phosphate positive electrode material. The method comprises the steps of grinding, drying and sintering. The method specifically comprises the following steps: 1, putting a ferromanganese phosphate precursor, a carbon source, a lithium source and pure water which are proportioned into a premixing tank of a nano sand mill; 2, after the nanometer sand mill is started for a period of time, the slurry is discharged in multiple batches; and 3, carrying out spray drying on the multi-batch discharged slurry to obtain lithium manganese iron phosphate yellow material powder. And 4, sintering the lithium manganese iron phosphate yellow material at high temperature to obtain the high-compaction lithium manganese iron phosphate positive electrode material. The method is mainly characterized in that in a lithium manganese iron phosphate slurry sanding stage, the lithium manganese iron phosphate slurry which is being ground is equ