Ultra-high Areal Capacity Realized in Three-Dimensional Holey Graphene/SnO2 Composite Anodes
Ultra-high Areal Capacity Realized in Three-Dimensional Holey Graphene/SnO2 Composite Anodes
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DOI：
10.1016/j.isci.2019.08.025
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发表时间：
2019-09-27
期刊：
影响因子：
5.8
通讯作者：
Duan, Xiangfeng
中科院分区：
文献类型：
--
作者：
Liang, Junfei;Sun, Hongtao;Duan, Xiangfeng
纳米结构的合金型电极材料及其复合材料在锂离子电池（LIB）中显示出非凡的前景，具有出色的重量容量。然而，迄今为止的研究通常仅限于实验室电池，其质量负荷太低（因此面积容量太低），无法产生重大的实际影响。本文中，通过将微米尺寸的SnO 2/石墨烯复合材料浸渍到3D多孔石墨烯框架（HGF）中，结果表明，在0.2 mA cm（-2）的电流密度下，3D-HGF/SnO 2复合阳极的容量可达14.5 mAh cm（-2），稳定的面积容量为9.5 mAh cm（-2）。在2.4mA cm（-2）的电流密度下，显著优于现有技术的研究设备或商业设备中的那些。这种高面积容量的稳健实现定义了在实际LIB中捕获高容量合金型电极材料的全部潜力的关键步骤。
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 SnO2/graphene composites into 3D holey graphene frameworks (HGF), we show that a well-designed 3D-HGF/SnO2 composite anode with a high mass loading of 12 mg cm(-2) can deliver an ultra-high areal capacity up to 14.5 mAh cm(-2) under current density of 0.2 mA cm(-2) and stable areal capacity of 9.5 mAh cm(-2) under current density of 2.4 mA cm(-2), 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.