| 초록 |
Sodium-ion batteries (SIBs) have been intensively investigated to meet the increasing demand for large-scale energy storage systems. However, it is still challenging to construct a functional full cell due to the limited material pool for both anodes and cathodes. Utilizing the wide range of vanadium redox states, herein, we report vanadium-based ortho-diphosphate, Na7V4(P2O7)4PO4 (or Na7VODP) as both cathode and anode active phase in a full-cell. The amophoteric nature allows Na7VODP to engage two vanadium redox couples, V3+/V4+ and V2+/V3+, for cathode and anode operations, respectively, within the stable voltage window of organic electrolytes. |
