【摘 要】
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Nanostructure design holds great potential in fabricating sulfur electrodes that host a high sulfur loading and still attain high electrochemical utilization fo
【机 构】
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School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;State
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Nanostructure design holds great potential in fabricating sulfur electrodes that host a high sulfur loading and still attain high electrochemical utilization for the developing of high-energy-density lithium-sulfur(Li-S)batteries.In this contribution,we introduce the yolk-shell structure into a freestanding carbon nanofibers film and construct a complete hollow yolk-shell TiO2/carbon nanofibers@void@TiN@carbon(TiO2-CNFs@void@TiN@C)composite.With inherent double conductive network and strong adsorption capability for polysulfides,the TiO2-CNFs@void@TiN@C composite can not only provide sufficient electri-cal contact for the insulating sulfur,but also effectively entrap polysulfides for prolonged cycle life.As a result,an excellent capacity retention ratio of 60.9％ after 1000 cycles at 1 C as well as a high capacity of 688.5 mAh g-1 at 5 C rate is accomplished with the cells employing TiO2-CNFs@void@TiN@C as a cath-ode substrate for sulfur.Moreover,the TiO2-CNFs@void@TiN@C composite,with a high S mass loading of 9.5 mg cm-2,delivers a superb areal capacity of 8.2 mAh cm-2.
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