Synthesis of ZnS/C Assisted by Foaming Strategy and Sodium-ion Storage Properties
ZnS is considered as a promising anode material for sodium-ion batteries due to its high capacity and moderate operating voltage.However,during the alloying/dealloying process,the volume changes greatly,resulting in poor cycling performance.At the same time,a similar"shuttle effect"will appear in lithium-sulfur batteries,which will seriously affect the electrochemical performance of the material.Carbon materials have been shown to trap polysulfides.Here,zinc nitrate hexahydrate(Zn(NO3)2·6H2O)and polyvinylpyrrolidone(PVP)as raw materials,ZnS/C were simply synthesized by chemical blowing and solid vulcanization method.Thanks to the porous structure of the material and the successful loading of nanoparticles on the porous carbon layer,the reaction kinetics is accelerated and the stress changes caused by volume changes are effectively mitigated,while the elastic conductive carbon matrix provides an interconnected electron transport pathway.At the current density of 2 A·g-1,a reversible capacity of 313 mAh·g-1 can be obtained even after 184 cycles.At the same time the magnification performance is good.
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