三维多孔石墨烯/SnO复合负极实现超高面积容量
Ultra-high Areal Capacity Realized in Three-Dimensional Holey Graphene/SnO Composite Anodes.
作者信息
Liang Junfei, Sun Hongtao, Zhao Zipeng, Wang Yiliu, Feng Zhiying, Zhu Jian, Guo Lin, Huang Yu, Duan Xiangfeng
机构信息
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA; School of Energy and Power Engineering, North University of China, Shanxi, Taiyuan 030051, P. R. China.
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA; Department of Industrial and Manufacturing Engineering, The Pennsylvania State University, University Park, PA 16802-4400, USA.
出版信息
iScience. 2019 Sep 27;19:728-736. doi: 10.1016/j.isci.2019.08.025. Epub 2019 Aug 20.
Nanostructured alloy-type electrode materials and its composites have shown extraordinary promise for lithium-ion batteries (LIBs) with exceptional gravimetric capacity. However, studies to date are usually limited to laboratory cells with too low mass loading (and thus too low areal capacity) to exert significant practical impact. Herein, by impregnating micrometer-sized SnO/graphene composites into 3D holey graphene frameworks (HGF), we show that a well-designed 3D-HGF/SnO composite anode with a high mass loading of 12 mg cm can deliver an ultra-high areal capacity up to 14.5 mAh cm under current density of 0.2 mA cm and stable areal capacity of 9.5 mAh cm under current density of 2.4 mA cm, considerably outperforming those in the state-of-art research devices or commercial devices. This robust realization of high areal capacity defines a critical step to capturing the full potential of high-capacity alloy-type electrode materials in practical LIBs.
纳米结构合金型电极材料及其复合材料在锂离子电池（LIB）领域展现出了卓越的前景，具备出色的重量比容量。然而，迄今为止的研究通常局限于质量负载过低（进而面积容量也过低）的实验室电池，难以产生显著的实际影响。在此，通过将微米级的SnO/石墨烯复合材料浸渍到三维多孔石墨烯框架（HGF）中，我们证明了一种精心设计的、质量负载高达12 mg/cm²的三维HGF/SnO复合阳极，在0.2 mA/cm²的电流密度下可提供高达14.5 mAh/cm²的超高面积容量，在2.4 mA/cm²的电流密度下具有9.5 mAh/cm²的稳定面积容量，显著优于当前最先进的研究设备或商业设备中的同类产品。这种高面积容量的稳健实现是在实际锂离子电池中充分发挥高容量合金型电极材料全部潜力的关键一步。
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