Regulation of carbon distribution to construct high-sulfur-content cathode in lithium-sulfur batteries |
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作者姓名: | Meng Zhao Yan-Qi Peng Bo-Quan Li Xue-Qiang Zhang Jia-Qi Huang |
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作者单位: | School of Materials Science and Engineering;Advanced Research Institute of Multidisciplinary Science;Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology |
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基金项目: | supported by Scientific and Technological Key Project of Shanxi Province(20191102003);National Key Research and Development Program(2016YFA0202500);the National Natural Science Foundation of China(21776019);Beijing Natural Science Foundation(L182021)。 |
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摘 要: | Lithium-sulfur(Li-S)battery is regarded as one of the most promising next-generation energy storage systems due to the ultra-high theoretical energy density of 2600 Wh kg-1.To address the insulation nature of sulfur,nanocarbon composition is essential to afford acceptable cycling capacity but inevitably sacrifices the actual energy density under working conditions.Therefore,rational structural design of the carbon/sulfur composite cathode is of great significance to realize satisfactory electrochemical performances with limited carbon content.Herein,the cathode carbon distribution is rationally regulated to construct high-sulfur-content and high-performance Li-S batteries.Concretely,a double-layer carbon(DLC)cathode is prepared by fabricating a surface carbon layer on the carbon/sulfur composite.The surface carbon layer not only provides more electrochemically active surfaces,but also blocks the polysulfide shuttle.Consequently,the DLC configuration with an increased sulfur content by nearly 10 wt%renders an initial areal capacity of 3.40 mAh cm-2 and capacity retention of 83.8%during 50 cycles,which is about two times than that of the low-sulfur-content cathode.The strategy of carbon distribution regulation affords an effective pathway to construct advanced high-sulfur-content cathodes for practical high-energy-density Li-S batteries.
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关 键 词: | Lithium-sulfur batteries High sulfur content High areal loading Double-layer carbon High energy density |
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