Bioconfined SnS2 N-doped carbon fibers with multiwall robust structure for boosting sodium storage

The development of biosynthetic materials is a front research area that offers significant possibility to design electrode materials with improved performance for energy storage. Here, we demonstrate a dual-carbon layer strategy for constructing SnS2 composite electrode material, where nitrogen doped carbon fibers derived from fungus and PDA carbon layer function as confined template and reinforced layer, respectively ([email protected]2@NCFs). When used as the anode material for the sodium ion battery, the [email protected]2@NCFs electrode exhibits good cycle stability of 382 mAh g-1 after 100 cycles at 0.1 A g-1 and rate performance of 158 mAh g-1 at 10 A g-1. Such good performances are benefited from the dual-carbon structure, which greatly restricts the expansion of the SnS2 crystal and the dissolution of polysulfide during the cycle and ensures the stability of the electrode structure.