分级多孔纳米碳球的制备及其在锂硫电池中的应用  

Preparation of Hierarchical Porous Carbon Nanosphere and Cathode Application for Lithium-Sulfur Batteries

作　　者：路继群 陈清清 任逸伦 胡倩倩 王彪 仲皓想[1,2,3] 胡金龙[1,2,3] 张灵志 LU Ji-qun;CHEN Qing-qing;REN Yi-lun;HU Qian-qian;WANG Biao;ZHONG Hao-xiang;HU Jin-long;ZHANG Ling-zhi(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Key Laboratory of Renewable Energy,Guangzhou 510460,China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学院可再生能源重点实验室,广州510640 [3]广东省新能源和可再生能源研究开发与应用重点实验室,广州510640 [4]中国科学院大学,北京100049 [5]中国科学技术大学,合肥230026

出　　处：《新能源进展》2020年第6期447-454,共8页Advances in New and Renewable Energy

基　　金：国家自然科学基金项目(21573239)。

摘　　要：以戊二醛(GA)与3-氨丙基三乙氧基硅烷(KH-550)为原料,通过醛胺缩合反应、高温煅烧以及碱刻蚀,制备了分级多孔纳米碳球(HPCN)。扫描电子显微镜(SEM)测试表明,制备的HPCN为平均粒径85.3 nm的单分散纳米球。将HPCN与单质S混合,通过熔融−扩散法制备HPCN/S正极材料,组装成锂硫(Li-S)电池后进行电化学测试。测试结果表明,HPCN/S具有优良的电化学性能,使用铝箔集流体时,在0.2 C循环100圈后放电比容量为472.1 mA·h/g;采用碳纸替代铝箔集流体制备的HPCN/S-CP正极,显示出更加优异的循环稳定性与倍率性能,在0.2 C循环100圈后放电比容量为636.1 mA·h/g,在1.0 C与2.0 C下的倍率比容量分别为702.7 mA·h/g、249.4 mA·h/g。Hierarchical porous carbon nanosphere(HPCN)was synthesized through the aldimine condensation between glutaraldehyde(GA)and 3-aminopropyltriethoxysilane(KH-550)followed by subsequent calcination and NaOH etching.Scanning electron microscopy(SEM)experiments showed that HPCN displays monodispersed nanospherical structure with an average diameter of 85.3 nm.HPCN/S cathode material was prepared by a melt-diffusion method and assembled into coin cells to conduct electrochemical test.HPCN/S material exhibited excellent electrochemical performance with a discharge capacity of 472.1 mA·h/g after 100 cycles at 0.2 C when using aluminium foil as current collector.When carbon paper collector was applied instead of aluminium foil,HPCN/S-CP cathode exhibited much more excellent cycling stability and rate performance with a discharge capacity of 636.1 mA·h/g after 100 cycles at 0.2 C,and rate capabilities of 702.7 mA·h/g and 249.4 mA·h/g at 1.0 C and 2.0 C respectively.

关 键 词：锂硫电池 HPCN/S正极材料 多孔纳米碳球 穿梭效应 碳纸 

分 类 号：TK02[动力工程及工程热物理]