Cui Lifeng, Xue Yanan, Noda Suguru, Chen Zhongming
School of Materials Science and Engineering, University of Shanghai for Science and Technology Shanghai 200093 China
Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan.
RSC Adv. 2018 Jan 9;8(5):2260-2266. doi: 10.1039/c7ra10498g.
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 g 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 g ). This S@GO-FWCNT composite self-supporting film is a promising cathode material for high energy density rechargeable Li-S batteries.
尽管锂硫（Li-S）电池是一种很有前景的二次电源，但它仍面临许多技术挑战，如快速的容量衰减和低硫利用率。硫的负载量以及硫在阴极中的重量百分比通常对能量密度有显著影响。在此，我们报道了一种易于合成的自支撑硫@氧化石墨烯-少壁碳纳米管（S@GO-FWCNT）复合阴极膜，其中铝箔集流体被FWCNTs取代，硫颗粒与FWCNTs一起被氧化石墨烯均匀包裹。通过超声处理的10 wt% FWCNT基体不仅在不借助金属箔的情况下提供了自支撑性能，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和循环稳定性，在500次循环后高达约385.7 mA h g ，且每循环的比容量降解接近约0.04%，这优于S@GO复合电极（353.1 mA h g ）。这种S@GO-FWCNT复合自支撑膜是一种有前景的用于高能量密度可充电锂硫电池的阴极材料。
