SnS@C nanospheres coated with few-layer MoS2 nanosheets and nitrogen, phosphorus-codoped carbon as robust sodium ion battery anodes
Tin sulfide (SnS) is attractive anode material for energy storage, but suffers from poor reversibility and serious polarization. In this work, to increase electron, ion transportation, and structure stability of SnS, polypyrrole-phosphomolybdic acid coated SnO2@C spheres are used as self-template, to construct MoS2 nanosheets and nitrogen, phosphorus-codoped carbon layer coated SnS@C nanospheres (SnS@C/MoS2@N,P-C). Endowed with the synergetic effect of SnS, MoS2, and carbon network, as anode material for sodium-ion batteries (SIBs), SnS@C/MoS2@N,P-C delivers first reversible capacity of 628 mAh g−1 with high initial Coulombic efficiency of 74.9%, capacity retention of 59.8% over 2000 cycles at 5.0 A g−1 and exceptional rate capability of 250 mAh g−1 at 10.0 A g−1. This high rate capability is possibly promoted by the pseudocapacitive behaviors attributed to the rich interfaces among different components. Moreover, the assembled full cell with Na3V2(PO4)3@C cathode exhibits a capacity of 455 mAh g−1 at 0.5 A g−1 after 50 cycles, showing good potential practical value in future.