材料科学
石墨烯
阴极
化学工程
碳纳米管
锂(药物)
硫黄
氧化物
复合数
堆积
微球
纳米技术
复合材料
有机化学
冶金
化学
物理化学
内分泌学
工程类
医学
作者
Jianli Wang,Zhen Meng,Wentao Yang,Xufeng Yan,Rongnan Guo,Weiqiang Han
标识
DOI:10.1021/acsami.8b17590
摘要
rGO/g-C3N4 and rGO/g-C3N4/CNT microspheres are synthesized through the simple ethanol-assisted spray-drying method. The ethanol, as the additive, changes the structure of the rGO/g-C3N4 or rGO/g-C3N4/CNT composite from sheet clusters to regular microspheres. In the microspheres, the pores formed by reduced graphene oxide (rGO), g-C3N4, and carbon nanotube (CNT) stacking provide physical confinement for lithium polysulfides (LiPSs). In addition, enriched nitrogen (N) atoms of g-C3N4 offer strong chemical adhesion to anchor LiPSs. The dual immobilization mechanism can effectively alleviate the notorious “shuttle effect” of the lithium–sulfur battery. Meanwhile, the cathode with high cyclic stability can be achieved. The rGO/g-C3N4/CNT/S cathode delivers a discharge capacity of 620 mA h g–1 after 500 cycles with a low capacity fading rate of only 0.03% per cycle at 1 C. Even, the cathode shows a retained capacity of 712 mA h g–1 over 300 cycles with a high sulfur loading (4.2 mg cm–2) at 0.2 C.
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