| abstract |
The invention discloses a preparation method and application of a negative electrode material for a sodium ion battery, including the synthesis of WS 2 /MoS 2 -G, the synthesis of WS 2 /MoS 2 -G@C and the application in the sodium ion battery. The hydrothermal synthesis of WS 2 /MoS 2 ‑G enables the formation of WS 2 , MoS 2 and heteroatom-doped graphene uniformly cross-linked together. The presence of sulfides alleviates the recompression of graphene and preserves graphene well. the specific surface area and conductivity; flexible graphene can slow down volume expansion, inhibit sulfide aggregation, introduce nanoscale dimensions, increase electrochemical activity, increase Na + adsorption, and obtain more ion storage sites. The final product of WS 2 /MoS 2 ‑G@C combines many advantages of sulfide and graphene, and the carbon precursor powder is carbonized to form amorphous carbon with good interlayer spacing, and the microstructure of the entire composite material is almost all layers The shape, combined with weak van der Waals force, can accommodate the back-and-forth deintercalation of larger Na + , and has good charge-discharge performance. |