High-energy density type polyanion positive electrode material, preparation method thereof and sodium ion battery positive electrode plate

• Main Authors: XU SHAOXIA, WANG GUANGJIN, PENG JUNQI, YANG ZIHAO, MO ZHIBO, ZOU JIAN, MA YONGTAO, XI YUKUN, LI JIAO, LI XIFEI, WANG JIANGTAO, LIU DONGZHU
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2024
• 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 provides a high-energy-density polyanion positive electrode material, a preparation method thereof and a sodium-ion battery positive electrode plate, and relates to the technical field of battery positive electrode materials. The structural formula of the positive electrode material is Na4Fe3-x-yMnxAy (PO4) 2 (P2O7)/C, x is more than 0 and less than 3, and y is more than 0.01 and less than 0.05; the A is a transition group metal, and the transition group metal comprises any one or a combination of at least two of V, Ti, Co and Ni; and C is a carbon coating layer coating the outer layer of the positive electrode material. According to the research of the applicant, the capacity and the energy density of the battery can be effectively improved by replacing part of Fe element with Mn element in the preparation of the NFPP positive electrode material; and meanwhile, a small amount of transition metal elements are doped on the basis, so that the cycling stability can be improved. Therefore, the probl