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Enhancing kinetics of Li-S batteries by graphene-like N,S-codoped biochar fabricated in NaCl non-aqueous ionic liquid

在NaCl非水离子液体中制备类石墨烯状氮硫共掺杂生物质碳材料来提高锂硫电池的动力学研究

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Abstract

Graphene-like N,S-codoped bio-carbon nanosheets (GNSCS) were prepared by a facile and environment-friendly NaCl non-aqueous ionic liquid route to house sulfur for lithium-sulfur battery. The natural nori powder was calcined at 900°C for 3 h under Ar, in which NaCl non-aqueous ionic liquid can exfoliate carbon aggregates into nanosheets. The structural characterization of GNSCS by a series of techniques demonstrates the graphene-like feature. When evaluated as the matrix for sulfur cathode, GNSCS/S exhibits more prominent cycling stability and rate capability. A discharge capacity of 548 mA h g−1 at a current density of 1.6 A g−1 after 400 cycles was delivered with a capacity fade rate of only 0.13% per cycle and an initial Coulombic efficiency (CE) as high as 99.7%. When increasing the areal sulfur loading up to 3 mg cm−2, the discharge capacity can still be retained at 647 mA h g−1 after more than 100 cycles with a low capacity degradation of only ~0.30% per cycle. The features of N/S dual-doping and the graphene-like structure are propitious to the electron transportation, lithium-ion diffusion and more active sites for chemically adsorbing polysulfides. It is anticipated that other functional biochar carbon can also be attained via the low-cost, sustainable and green method.

摘要

本论文通过结构设计利用简单方法成功制备了一种二维N,S共掺杂类石墨烯纳米片复合结构, 即利用NaCl非离子液体的剥离作用 使生物质剥离得到二维片层类石墨烯结构. 这种新的非离子液体剥离技术较其他的碳材料剥离技术具有环境友好性、 低成本、 安全无毒 性等优势, 有利于实现量化制备锂硫电池电极材料. 该材料采用大自然中广泛存在的紫菜作为原料, 其内部富含的氨基酸为原位掺杂N,S元素提供了可能性. 二维结构的纳米片能够提供有效的导电性和电解液浸润性的网络结构, 同时还能够有效地降低电池在充放电循环过 程中导致的体积膨胀效应, 最终实现一种高机械性能、 优异电化学活性的电极在锂硫电池储能领域中的应用.

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Acknowledgements

The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (21601108 and U1764258), Young Scholars Program of Shandong University (2017WLJH15), the Fundamental Research Funds of Shandong University (2016JC033 and 2016GN010), and the Taishan Scholar Project of Shandong Province (ts201511004).

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Authors and Affiliations

  1. Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China

    Man Huang  (黄曼), Jingyu Yang  (杨靖宇), Baojuan Xi  (奚宝娟), Kan Mi  (弭侃), Zhenyu Feng  (封振宇), Yitai Qian  (钱逸泰) & Shenglin Xiong  (熊胜林)

  2. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Jing Liu  (刘静)

  3. Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China

    Jinkui Feng  (冯金奎)

  4. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China

    Yitai Qian  (钱逸泰)

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  1. Man Huang  (黄曼)
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  6. Jing Liu  (刘静)
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  8. Yitai Qian  (钱逸泰)
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  9. Shenglin Xiong  (熊胜林)
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Correspondence to Shenglin Xiong  (熊胜林).

Additional information

Man Huang got her Master degree from Jiangsu University of Science and Technology. Now, she is a PhD student under the supervision of Prof. Shenglin Xiong and Prof. Yitai Qian at the School of Chemistry and Chemical Engineering, Shandong University, China. Her research interests mainly focus on the design and fabrication of novel carbon nanostructures for energy conversion and storage.

Shenglin Xiong received his PhD degree in inorganic chemistry from the University of Science & Technology of China in 2007. He worked at National University of Singapore from 2009 to 2011 as a Research Fellow. He is now a professor at the School of Chemistry and Chemical Engineering, Shandong University. His research interests include the design and development of micro/nanostructured composite materials and their applications in energy storage and conversion.

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Huang, M., Yang, J., Xi, B. et al. Enhancing kinetics of Li-S batteries by graphene-like N,S-codoped biochar fabricated in NaCl non-aqueous ionic liquid. Sci. China Mater. 62, 455–464 (2019). https://doi.org/10.1007/s40843-018-9331-x

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