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首页> 外文期刊>Advanced Functional Materials >Tin Oxide with Controlled Morphology and Crystallinity by Atomic Layer Deposition onto Graphene Nanosheets for Enhanced Lithium Storage
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Tin Oxide with Controlled Morphology and Crystallinity by Atomic Layer Deposition onto Graphene Nanosheets for Enhanced Lithium Storage

机译：通过在石墨烯纳米片上进行原子层沉积来控制形态和结晶度的氧化锡，用于增强锂存储

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摘要

As one of the most promising negative electrode materials in lithium-ion batteries (LIBs), SnO_2 experiences intense investigation due to its high specific capacity and energy density, relative to conventional graphite anodes. In this study, for the first time, atomic layer deposition (ALD) is used to deposit SnO_2, containing both amorphous and crystalline phases, onto graphene nanosheets (CNS) as anodes for LIBs. The resultant SnO_2-graphene nanocomposites exhibit a sandwich structure, and, when cycled against a lithium counter electrode, demonstrate a promising electrochemical performance.It is demonstrated that the introduction of GNS into the nanocomposites is beneficial for the anodes by increasing their electrical conductivity and releasing strain energy: thus, the nanocomposite electrode materials maintain a high electrical conductivity and flexibility. It is found that the amorphous SnO_2-GNS is more effective than the crystalline SnO_2-CNS in overcoming electrochemical and mechanical degradation; this observation is consistent with the intrinsically isotropic nature of the amorphous SnO_2, which can mitigate the large volume changes associated with charge/discharge processes. It is observed that after 150 charge/discharge cycles, 793 mA h g~(-1) is achieved. Moreover, a higher coulombic efficiency is obtained for the amorphous SnO_2-CNS composite anode. This study provides an approach to fabricate novel anode materials and clarifies the influence of SnO_2 phases on the electrochemical performance of LIBs.
机译：作为锂离子电池（LIB）中最有希望的负极材料之一，SnO_2由于其比容量高和能量密度高而相对于传统的石墨阳极经历了广泛的研究。在这项研究中，第一次，原子层沉积（ALD）用于将包含非晶相和结晶相的SnO_2沉积到石墨烯纳米片（CNS）上，作为LIB的阳极。所得的SnO_2-石墨烯纳米复合材料表现出三明治结构，当与锂对电极循环时，显示出令人鼓舞的电化学性能。事实证明，将GNS引入纳米复合材料通过增加其电导率和释放对阳极有利。应变能：因此，纳米复合电极材料保持高导电性和柔韧性。发现非晶SnO_2-GNS在克服电化学和机械降解方面比结晶SnO_2-CNS更有效。该观察结果与非晶SnO_2的固有各向同性性质相符，后者可以减轻与充电/放电过程相关的大体积变化。观察到在150次充电/放电循环之后，获得了793mA h g〜（-1）。此外，非晶SnO_2-CNS复合阳极的库仑效率更高。这项研究提供了一种制造新型阳极材料的方法，并阐明了SnO_2相对LIBs电化学性能的影响。

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  • 来源
    《Advanced Functional Materials》 |2012年第8期|p.1647-1654|共8页
  • 作者

    Xifei Li; Xiangbo Meng; Jian Liu; Dongsheng Geng; Yong Zhang; Mohammad Norouzi Banis; Yongliang Li; Jinli Yang; Ruying Li; Xueliang Sun; Mei Cai; Mark W. Verbrugge;

  • 作者单位

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    Nanomaterials and Energy Lab Department of Mechanical and Materials Engineering University of Western Ontario London, Ontario, N6A 5B9, Canada;

    General Motors R&D Center Warren, Ml 48090-9055, USA;

    General Motors R&D Center Warren, Ml 48090-9055, USA;

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