Aqueous iron ion battery positive electrode active material, preparation method thereof and iron ion battery

• Main Authors: DING YU, DU CHENGYUE, XIONG MEIQI, FENG KAIKAI, YANG CAISHENG, PI YUQIANG, CHEN JINGJING, WANG FENG
• Format: Patent
• Language: Chinese; English
• Published: 08.08.2023
• 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 an aqueous iron ion battery positive electrode active material, a preparation method thereof and an iron ion battery, and belongs to the technical field of secondary lithium ion batteries. The chemical formula of the positive electrode active material is K3V2 (PO4) 3, and the preparation method comprises the following steps: S1, adding a potassium source, a vanadium source, a phosphorus source and a carbon source into a ball milling solvent to obtain a mixed solution; s2, carrying out ball milling on the mixed solution obtained in the step S1 until the particle size of suspended particles is 100nm-3mu m, so as to obtain a precursor dispersion liquid; s3, performing spray drying on the precursor dispersion liquid obtained in the step S2 to obtain precursor powder; and S4, sintering the precursor powder obtained in the step S3 in an inert atmosphere to obtain the composite material. The positive electrode active material K3V2 (PO4) 3 provided by the invention has high specific discharge