Nanoengineered three-dimensional hybrid Fe2O3@PPy nanotube arrays with enhanced electrochemical performances as lithium–ion anodes
Nanoengineered three-dimensional hybrid Fe2O3@PPy nanotube arrays with enhanced electrochemical performances as lithium–ion anodes
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DOI：
10.1007/s10853-015-9096-8
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发表时间：
2015-05
影响因子：
4.5
通讯作者：
Hongyan Yang;Xiaohui Yu;Hao Meng;P. Dou;D. Ma;Xinhua Xu
中科院分区：
文献类型：
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作者：
Hongyan Yang;Xiaohui Yu;Hao Meng;P. Dou;D. Ma;Xinhua Xu
为了优化锂离子电池（LIB）的电极系统，解决锂离子扩散、电子传输和循环过程中大体积变化等问题，通过牺牲模板加速水解方法和化学气相聚合过程合成了一种新型的涂有聚吡咯（Fe2O3@PPy）的三维（3D）杂化Fe2O3纳米管阵列阳极。在空心核壳纳米结构中，导电PPy层不仅可以促进电子传输，还可以迫使核向内膨胀到空心空间中，从而允许Fe2O3自由体积膨胀而不会发生机械断裂。此外，静态外表面有助于形成稳定的固体电解质界面膜。因此，集成的3D混合纳米结构电极在150次循环后能够保持665 mA h g−1的高容量，库仑效率高于97%，与裸Fe2O3纳米管阵列阳极相比，表现出更好的循环性能。这种纳米工程策略被证明是开发高性能锂离子电池阳极的理想选择。
In order to optimize the electrode system of lithium–ion batteries (LIBs) for problems like lithium-ion diffusion, electron transport, and large volume change during cycling processes, a novel three-dimensional (3D) hybrid Fe2O3nanotube array anode coated by polypyrrole (Fe2O3@PPy) is synthesized via a sacrificial template-accelerated hydrolysis method followed by a chemical vapor-phase polymerization process. In the hollow core–shell nanostructures, the conducting PPy layer could not only facilitate the electron transport, but also force the core to expand inward into the hollow space, which allows for free volume expansion of the Fe2O3without mechanical breaking. Besides, the static outer surface is contributed to form a stable solid electrolyte interface film. As a result, the integration of 3D hybrid nanostructure electrode is capable of retaining a high capacity of 665 mA h g−1after 150 cycles with a coulombic efficiency of above 97 %, revealing better cycling properties compared with bare Fe2O3nanotube arrays’ anode. This nanoengineering strategy is proven to be an ideal candidate for the development of high-performance anode for LIBs.