Preparation method of nitrogen-doped biochar-coated spherical lithium manganese iron phosphate composite electrode material

• Main Authors: LIU BO, CHEN HUFEI, WANG ZHANGJIAN, YU YEFAN
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention provides a preparation method of a nitrogen-doped biochar-coated spherical lithium manganese iron phosphate composite electrode material. The method comprises the following steps: preparing biomass-coated gel; preparing spherical lithium manganese iron phosphate slurry; preparing a biomass gel coated spherical lithium manganese iron phosphate precursor; and preparing the nitrogen-doped charcoal-coated spherical lithium manganese iron phosphate electrode material. The coated nitrogen-containing carbon source selected by the method comes from waste biomass raw materials such as shrimp and crab shells, so that solid wastes are recycled, and the cost of the raw materials is reduced; the biomass gel prepared through simple reaction has an efficient adsorption effect on a lithium manganese iron phosphate precursor, uniform and compact coating of a biomass carbon source on the surfaces of precursor particles is realized, and finally, a nitrogen-doped carbon layer is generated through carbon thermal red