多硫化物
气凝胶
材料科学
碳化
复合数
复合材料
硫黄
碳纤维
锂(药物)
纳米纤维素
多孔性
储能
化学工程
纤维素
化学
电解质
电极
冶金
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
扫描电子显微镜
作者
Jisi Chen,Yan Liu,Zhikang Liu,Yu Chen,Chenggang Zhang,Yanan Yin,Quanling Yang,Zhuqun Shi,Chuanxi Xiong
标识
DOI:10.1016/j.colsurfa.2020.125249
摘要
Owing to the low cost, high theoretical specific energy density and environmentally friendly, Lithium-sulfur (Li-S) batteries have become one of the most promising candidates for electrical energy storage systems. However, some technical obstacles of lithium sulfur batteries are still addressed, such as the volume expansion, non-conductivity and shuttle effect of polysulfides. Herein, we have described a simple method for preparing carbon nanofiber aerogel (CNFA) via carbonization of the 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) aerogel. Special three-dimensional (3D) net-like [email protected] ([email protected]) composite was then successfully fabricated based on CNFA with high porosity, which dramatically alleviates the volume expansion during charging and discharging process of lithium-sulfur battery, improves the conductivity of polysulfide and suppresses the diffusion and dissolution of polysulfide generated during the charge and discharge process. The results showed that the composite material exhibited an extremely high reversible capacity of 590 mA h g−1 and had a great loaded performance of 390 mA h g−1 with high load 2.9 mg/cm2 over 200 cycles at 0.5 C. Compared with other biomass carbon materials, we have omitted the complicated high-temperature activation pore-forming process. In addition, the high sulfur loading carbon nanofibril composite aerogel also provides a way for the high-quality needs of electronic products.
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