Abstract
Yolk-shell structure with inner void and tunable components over the yolk and shells, usually shows superiorities for energy storage. In this work, using a solid ZnSn(OH)6 nanocube precursor, yolk-shell ZnS@NC@MoS2 nanoboxes are designed through a step by step strategy, involving a polydopamine coating, high-temperature sulfurization, selective etching, and growth of MoS2 nanosheets. This yolk-shell ZnS@NC@MoS2 nanoboxes with inner yolk of ZnS nanoparticles and double-shells of NC and MoS2 nanosheets, can provide increased active sites and ion channels among the interfacial boundaries, high conductivity and stable structure for the sodium ion batteries (SIBs) anode. Benefited from the structure properties, ZnS@NC@MoS2 presents a capacity of 297 mAh g−1 at current of 1.0 A g−1 after 120 cycles and excellent rate performance (461.4 mAh g−1 at 0.1 A g−1 and 220.1 mAh g−1 at 10 A g−1) as anode material for SIBs, which are superior to the ZnS@NC anode. Furthermore, a reversible capacity of 321.8 mAh g−1 can be maintained at 0.5 A g−1 after 50 cycles in a full cell, when coupled with home-made Na3V2(PO4)3@C.
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