Three-phase composite sodium storage material as well as preparation method and application thereof

The invention discloses a three-phase composite sodium storage material as well as a preparation method and application thereof, relates to the technical field of batteries, and aims to solve the problem that the electrochemical performance of a sodium ion battery is relatively high in reduction speed during charging and discharging. The three-phase composite sodium storage material is selected from any one of structures shown in the following general formula: (FeS) x/(V3S4) y/C, wherein 0.2 < = x < = 5, and 0.2 < = y < = 5. Through the synergistic effect of FeS, V3S4 and C in the three-phase composite sodium storage material provided by the embodiment of the invention, the cycling stability and rate capability of the three-phase composite sodium storage material as an electrode material can be well improved, and the reduction speed of the electrochemical performance of a sodium ion battery during charging and discharging is further reduced.