| abstract |
The present invention provides a kind of Na 3 V 2 (PO 4 ) 3 /nitrogen-doped carbon and its preparation method based on organic phosphonic acid synthesis of sodium ion battery cathode material. To obtain a clear solution A, dissolve the vanadium source to obtain a clear solution B; add the B solution to the above A solution to form a mixed solution C; heat and stir the C mixed solution at 80°C to 100°C until the water is evaporated to dryness, and the obtained The gel-like substance is put into an oven and dried at 80°C-100°C for 5-12h; the obtained solid is ground and sintered twice under the protection of argon to obtain the product. Among them, organic phosphonic acid has multiple functions, that is, it not only acts as the source of phosphonate in Na 3 V 2 (PO 4 ) 3 , but also acts as a nitrogen source and a carbon source. Compared with the existing method, the method of the invention is simple, easy to control and low in cost, and the preparation of Na 3 V 2 (PO 4 ) 3 /nitrogen-doped carbon has high specific capacity, good cycle stability and rate performance. |