Preparation method of iron-based polyanionic composite positive electrode material and application of sodium ion battery

The invention belongs to the technical field of sodium ion batteries, and mainly relates to a preparation method of an iron-based polyanionic composite positive electrode material and application of a sodium ion battery. According to the preparation method, ferrous sulfate heptahydrate, sodium sulfate, an antioxidant and carbon nanotubes are taken as reactants, a precursor material is rapidly obtained through a freeze-drying technology, and the precursor is subjected to short-time low-temperature sintering to prepare the high-performance iron-based polyanionic composite positive electrode material. The preparation method is simple in synthesis process and good in electrochemical performance, and provides more technical reserve for optimization and production development of the iron-based polyanionic composite positive electrode material for the sodium-ion battery. 本发明属于钠离子电池技术领域，主要涉及一种铁基聚阴离子型复合正极材料的制备方法及钠离子电池应用。本发明以七水合硫酸亚铁，硫酸钠，抗氧化剂，碳纳米管为反应物，通过冷冻干燥技术实现快速获得前驱体材料，并将前驱体通过短时间低温烧结后制备出高性能铁基聚阴离子型复合正极材料。本发明合成工艺简单，同时兼具