Nanoscale olivine-type sodium ferric phosphate as well as preparation method and application thereof

The invention belongs to the technical field of sodium ion battery materials, and particularly relates to nanoscale olivine-type sodium ferric phosphate as well as a preparation method and application thereof. Weighing lithium iron phosphate, and placing the lithium iron phosphate in a planetary ball mill for dry grinding to obtain nanoscale lithium iron phosphate; the method comprises the following steps: weighing nanoscale lithium iron phosphate in an argon glove box, putting the nanoscale lithium iron phosphate into an organic solvent, adding an oxidizing agent, stirring, centrifuging and drying in vacuum to generate iron phosphate; the preparation method comprises the following steps: in an argon glove box, grinding iron phosphate, preventing water absorption and avoiding caking, weighing the iron phosphate, putting the iron phosphate into an organic solvent, adding a reducing agent, stirring, centrifuging and drying in vacuum to obtain sodium iron phosphate, namely the nanoscale olivine type sodium iron