Epitaxial Growth of Branched α‐Fe2O3/SnO2 Nano‐Heterostructures with Improved Lithium‐Ion Battery Performance
Epitaxial Growth of Branched α‐Fe2O3/SnO2 Nano‐Heterostructures with Improved Lithium‐Ion Battery Performance
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DOI：
10.1002/adfm.201100088
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发表时间：
2011-07
影响因子：
19
通讯作者：
Weiwei Zhou;Chuanwei Cheng;Jinping Liu;Y. Tay;Jian Jiang;Xingtao Jia;Jixuan Zhang;H. Gong;
中科院分区：
文献类型：
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作者：
Weiwei Zhou;Chuanwei Cheng;Jinping Liu;Y. Tay;Jian Jiang;Xingtao Jia;Jixuan Zhang;H. Gong;
本文报道了一种由SnO2纳米线和α - Fe2O3纳米棒分支组成的新型支链纳米异质结构的合成方法。利用高分辨率透射电镜（HRTEM）研究了枝和茎之间的外延关系。确定SnO2纳米线沿[101]方向生长，由四个侧面包围。结果表明，SnO2茎的不同晶体平面可诱导次级纳米棒分支的不同优先生长方向，导致六重对称而不是四重对称。此外，作为功能的概念验证，这种α - Fe2O3/SnO2复合材料被用作锂离子电池（LIBs）的阳极材料。低初始不可逆损耗和高可逆容量，证明了比较，这两个单一的组件。SnO2和α‐Fe2O3的协同作用以及其独特的分支结构可能是其性能增强的原因。
We report the synthesis of a novel branched nano‐heterostructure composed of SnO2 nanowire stem and α‐Fe2O3 nanorod branches by combining a vapour transport deposition and a facile hydrothermal method. The epitaxial relationship between the branch and stem is investigated by high resolution transmission electron microscopy (HRTEM). The SnO2 nanowire is determined to grow along the [101] direction, enclosed by four side surfaces. The results indicate that distinct crystallographic planes of SnO2 stem can induce different preferential growth directions of secondary nanorod branches, leading to six‐fold symmetry rather than four‐fold symmetry. Moreover, as a proof‐of‐concept demonstration of the function, such α‐Fe2O3/SnO2 composite material is used as a lithium‐ion batteries (LIBs) anode material. Low initial irreversible loss and high reversible capacity are demonstrated, in comparison to both single components. The synergetic effect exerted by SnO2 and α‐Fe2O3 as well as the unique branched structure are probably responsible for the enhanced performance.