• 专利标题:   Positive electrode active material for calcium-ion battery, comprises sodium vanadyl fluorophosphate/reduced graphene oxide obtained by compounding sodium vanadyl fluorophosphate with reduced graphene and electrochemically removing sodium.
  • 专利号:   CN115939405-A
  • 发明人:   ZHOU L, MAI L, JIN S, AN Q
  • 专利权人:   UNIV WUHAN TECHNOLOGY SANYA SCI EDUCAT
  • 国际专利分类:   B82Y030/00, C01B025/455, C01B032/194, H01M010/054, H01M004/02, H01M004/58, H01M004/62
  • 专利详细信息:   CN115939405-A 07 Apr 2023 H01M-004/62 202338 Chinese
  • 申请详细信息:   CN115939405-A CN10237414 14 Mar 2023
  • 优先权号:   CN10237414

▎ 摘  要

NOVELTY - A positive electrode active material comprises sodium vanadyl fluorophosphate/reduced graphene oxide obtained by compounding sodium vanadyl fluorophosphate with reduced graphene and electrochemically removing sodium. USE - Active material used in positive electrode material for calcium-ion battery (all claimed). ADVANTAGE - The active material can improve the working voltage and cycle life of the existing calcium ion battery. DETAILED DESCRIPTION - A positive electrode active material comprises sodium vanadyl fluorophosphate (NaV2O2(PO4)2F)/reduced graphene oxide (rGO) obtained by compounding sodium vanadyl fluorophosphate with reduced graphene and electrochemically removing sodium. INDEPENDENT CLAIMS are included for the following: (1) preparation of positive electrode active material, which involves dissolving and mixing sodium salt, phosphorus source, fluorine source and vanadium source to obtain a mixed solution, adding a graphene dispersion to the mixed solution for ultrasonication, transferring the ultrasonically mixed solution to a reactor for hydrothermal reaction, naturally cooling to room temperature after the reaction to obtain a black product, centrifuging and washing the black product, freeze-drying to obtain hollow nano-spherical sodium vanadyl fluorophosphate compounded with reduced graphene (Na3V2O2(PO4)2F/rGO), and removing two sodium ions in sodium vanadyl fluorophosphate by topological substitution to obtain NaV2O2(PO4)2F/rGO; and (2) usage method of positive electrode active material in positive electrode material of calcium-ion battery.