An ultra‐stable sodium half/full battery based on a unique micro‐channel pine‐derived carbon/SnS2@reduced graphene oxide film

Abstract Developing super stability, high coulomb efficiency, and long‐span life of sodium‐ion batteries (SIBs) can significantly widen their practical industrial applications. In this study, we report a pine‐derived carbon/SnS 2 @reduced graphene oxide (PDC/SnS 2 @rGO) film with fast ion/electron transport micro‐channel used as a SIB anode, which shows ultrahigh stable stability and long‐span life. Functionally, a biomass PDC/SnS 2 @rGO film with ~30 μm micro carbon channel and ~1.2 μm thick carbon wall can simultaneously provide the fast electron transport path and the Na + transport channel. Also, the two‐dimensional (2D) layered SnS 2 particles attached to the carbon wall of PDC can increase more Na + contact sites and shorten the Na + transport path in the NaPF 6 electrolyte. To avoid the separation of SnS 2 from PDC during the sodiation process, rGO with excellent conductivity and flexibility is wrapped in the SnS 2 outer layer as an “electronic garment”. A ~650 mA h g −1 high Na + storage capacity at 0.1 A g −1 and ~99.8% ultrahigh coulomb efficiency after 800 cycles at 5 A g −1 are obtained when PDC/SnS 2 @rGO film is used as a SIB anode. Furthermore, a SIB full‐cell is assembled using PDC/SnS 2 @rGO film (anode) and Na 3 V 2 (PO 4 ) 3 (cathode), which exhibits a ~163.9 mA h g −1 high reversible capacity and ~99.7% coulomb efficiency performance. Our work provides a reasonable design strategy for the application of biomass‐derived carbon in SIBs, which may inspire more biomass‐derived material studies.