Mofs-Derived Flower-Like Hierarchically Porous Zn-Mn-Se/C Composite for Extraordinary Rate Performance and Durable Anode of Sodium-Ion Batteries

Transition metal selenides have emerged as promising anode materials for sodium ion batteries (SIBs) while the large-scale application remains a challenge due to the inferior rate performance and short cycling life. Herein, the “flower-like” porous carbon anchored by Zn-Mn binary selenides (ZMS@FC) composites were fabricated by selenizing the modified hierarchically metal-organic frameworks (MOFs) precursors. The “pedals” were composed of novel 2D conductive hierarchically flakes with abundant pore structure and multiple active sites. Benefiting from the synergistic effect of the binary metals and intrinsic large pseudocapacitive contribution, ZMS@FC composites exhibited impressive rate capability of 294.4 mA h g-1 at 10 A g-1 and excellent cyclic stability with 369.6 mA h g-1 specific capacity retention at 2 A g-1 after 1000 cycling when evaluated as anode materials for SIBs. Moreover, the reversible electrochemical mechanism of the Zn-Mn-Se was verified by the ex-situ X-ray diffraction patterns and transmission electron microscope images. The synthesis strategy of the hierarchical porous architecture and the inherent advantage of bimetal selenides make the ZMS@FC composites become a competitive candidate for anode materials of SIBs, and enlighten a novel way to the design of electrode materials