Dual carbon coated SnTe/CoTe2 composite material as well as preparation method and application thereof

The invention provides a dual-carbon-coated SnTe/CoTe2 composite material and a preparation method and application thereof, the dual-carbon-coated SnTe/CoTe2 composite material has a core-shell structure which takes hollow porous SnTe/CoTe2 as a core and is coated with carbon nanofibers on the outer layer, and internal gaps of the carbon nanofibers and hollow parts of the SnTe/CoTe2 are filled with carbon materials. When the dual carbon confinement SnTe/CoTe2 composite material is used as a sodium ion battery negative electrode material, under the current density of 0.2 A/g, the first-circle capacity is not lower than 697.4 mAh/g, the 50-circle cycle capacity is not lower than 321.5 mAh/g, the capacity retention ratio is 46.10% or above, the discharge specific capacity is still 283.4 mAh/g after 200 cycles under the condition of 1A/g, and the composite material has excellent rate capability, high reversible specific capacity and long cycle life.