| abstract |
Provided by the present invention is a sodium ion battery positive electrode material having a coating structure and a preparation method therefor. In the present invention, an Na3V2(PO4)3/C positive electrode material is prepared by means of a sol-gel method, and synthetic zwitterionic polymers may be used as chelating agents and act as a carbon source; the process is simple, a gel may quickly be formed, and the reaction time is shortened; also, a zwitterionic structure is contained, which may dissolve very well with a sodium vanadium phosphate precursor to form a stable carbon coating layer. Compared to the prior art, the sodium ion battery positive electrode material of the present invention enhances the electrical conductivity and cycle performance of the positive electrode material by means of doping nitrogen elements and sulfur elements on carbon. At the same time, the prepared sodium ion battery positive electrode material has a sodium vacancy, which ensures the stability of the structure during a sodium ion embedding/removal process. |