Hierarchical Scalelike Yolk-Shell Construction Assembled via Ultrathin MoSe2 Nanoplates Incorporated into Metal-Organic Frameworks Derived Porous Carbon Spheres as Highly Durable Anode for Enhanced Sodium Storage

Transition metal dichalcogenides (TMDs) as a mainstream ion-storage carrier still suffer from poor electronic conductivity and structural pulverization/degradation upon cycling. A highly integrated carbon@TMDs-based hierarchical configuration can endow significant performance enhancement of sodium-ion batteries (SIBs) related to the strong coupling effect between the two components together with their high ion migration rate and robust structural stability. Herein, a hierarchical scalelike yolk-shell architecture is legitimately designed and constructed through incorporating ultrathin MoSe2 nanoplates into nickel-based metal-organic frameworks (Ni-MOFs)-derived porous carbon spheres (denoted as MoSe2@MPCS). The porous carbon spheres create a highly conductive matrix for fast charge-transfer kinetics and guarantee the desired buffer space for high mass loading while endowing abundant active species and high mechanical strength. As might be expected, the MoSe2@MPCS electrode in SIB systems maintains oustanding electrochemical performance with the remarkable discharge capacity of 427.4 mAh g(-1) at 2 A g(-1) at 150 cycles and 254.4 mAh g(-1) at 5 A g(-1) at 1800 cycles; specifically, it shows superior rate cycling durability of 5300 cycles accompanied by a capacity of 142.5 mAh g(-1), even cycled at 8 A g(-1). In addition, regulating the sodiation/desodiation voltage range of MoSe2@MPCS electrode at 0.5-3.0 V can motivate more ultrastable cycling life over 10 000 cycles maintaining 216.7 mAh g(-1) at 5 A g(-1). Such a highly durable MoSe2@carbon-based anode is potentially helpful for the rapid commercialization process of SIBs.