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

作     者：Man Huang Jingyu Yang Baojuan Xi Kan Mi Zhenyu Feng Jing Liu Jinkui Feng Yitai Qian Shenglin Xiong 黄曼;杨靖宇;奚宝娟;弭侃;封振宇;刘静;冯金奎;钱逸泰;熊胜林

作者机构：Key Laboratory of the Colloid and Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University College of Materials Science and Engineering Qingdao University of Science and Technology Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials(Ministry of Education) School of Materials Science and Engineering Shandong University Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2019年第62卷第4期

页      面：455-464页

核心收录：

学科分类：081702[工学-化学工艺] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：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) the Taishan Scholar Project of Shandong Province (ts201511004) 

主　　题：nori powder graphene-like N S-codoped bio-carbon nanosheets NaCl non-aqueous ionic liquid reaction kinetics lithium-sulfur batteries 

摘      要：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 *** 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.