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首页> 外文期刊>RSC Advances >Self-supporting S@GO–FWCNTs composite films as positive electrodes for high-performance lithium–sulfur batteries
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Self-supporting S@GO–FWCNTs composite films as positive electrodes for high-performance lithium–sulfur batteries

机译：自支撑S @ GO–FWCNTs复合膜作为高性能锂硫电池的正极

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摘要

Although lithium–sulfur (Li–S) batteries are a promising secondary power source, it still faces many technical challenges, such as rapid capacity decay and low sulfur utilization. The loading of sulfur and the weight percentage of sulfur in the cathode usually have a significant influence on the energy density. Herein, we report an easy synthesis of a self-supporting sulfur@graphene oxide-few-wall carbon nanotube (S@GO–FWCNT) composite cathode film, wherein an aluminum foil current collector is replaced by FWCNTs and sulfur particles are uniformly wrapped by graphene oxide along with FWCNTs. The 10 wt% FWCNT matrix through ultrasonication not only provided self-supporting properties without the aid of metallic foil, but also increased the electrical conductivity. The resulting S@GO–FWCNT composite electrode showed high rate performance and cycle stability up to ～385.7 mA h gelectrode?1 after 500 cycles and close to ～0.04% specific capacity degradation per cycle, which was better than a S@GO composite electrode (353.1 mA h gelectrode?1). This S@GO–FWCNT composite self-supporting film is a promising cathode material for high energy density rechargeable Li–S batteries.
机译：尽管锂硫（Li–S）电池是有前途的二次电源，但它仍面临许多技术挑战，例如容量快速下降和硫利用率低。阴极中硫的负载量和硫的重量百分比通常对能量密度有重要影响。在本文中，我们报道了一种易于合成的自支撑硫@氧化石墨烯-短壁碳纳米管（S @ GO-FWCNT）复合阴极膜，其中铝箔集流体被FWCNT取代，硫颗粒被均匀包裹氧化石墨烯和FWCNT。通过超声处理的10 wt％FWCNT基质不仅在没有金属箔的情况下提供了自支撑性能，而且还提高了电导率。所得的S @ GO–FWCNT复合电极表现出高倍率性能，循环稳定性高达〜385.7 mA hg 电极 ？1 < / small> 500次循环后，每循环的比容量下降接近〜0.04％，优于S @ GO复合电极（353.1 mA hg 电极 ？1 ）。这种S @ GO–FWCNT复合自支撑膜是用于高能量密度可充电Li–S电池的有希望的阴极材料。

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