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首页> 外文期刊>Chemistry: A European journal >A Core-Shell Fe/Fe2O3 Nanowire as a High-Performance Anode Material for Lithium-Ion Batteries
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A Core-Shell Fe/Fe2O3 Nanowire as a High-Performance Anode Material for Lithium-Ion Batteries

机译：核壳型Fe / Fe2O3纳米线作为锂离子电池的高性能阳极材料

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摘要

The preparation of novel one-dimensional coreshell Fe/Fe2O3 nanowires as anodes for high-performance lithium-ion batteries (LIBs) is reported. The nanowires are prepared in a facile synthetic process in aqueous solution under ambient conditions with subsequent annealing treatment that could tune the capacity for lithium storage. When this hybrid is used as an anode material for LIBs, the outer Fe2O3 shell can act as an electrochemically active material to store and release lithium ions, whereas the highly conductive and inactive Fe core functions as nothing more than an efficient electrical conducting pathway and a remarkable buffer to tolerate volume changes of the electrode materials during the insertion and extraction of lithium ions. The core-shell Fe/Fe2O3 nanowire maintains an excellent reversible capacity of over 767 mAhg(-1) at 500 mAg(-1) after 200 cycles with a high average Coulombic efficiency of 98.6 %. Even at 2000 mAg(-1), a stable capacity as high as 538 mAhg(-1) could be obtained. The unique composition and nanostructure of this electrode material contribute to this enhanced electrochemical performance. Due to the ease of large-scale fabrication and superior electrochemical performance, these hybrid nanowires are promising anode materials for the next generation of high-performance LIBs.
机译：报道了新型一维核壳Fe / Fe2O3纳米线作为高性能锂离子电池（LIBs）阳极的制备。纳米线是在环境条件下在水溶液中以简便的合成方法制备的，随后进行退火处理可以调节锂的存储能力。当这种混合材料用作LIB的阳极材料时，Fe2O3的外层壳可以充当电化学活性材料来存储和释放锂离子，而高导电性和非活性的Fe核则仅起到有效的导电路径和作用。出色的缓冲剂可承受锂离子插入和提取过程中电极材料的体积变化。芯-壳Fe / Fe2O3纳米线经过200次循环后，在500 mAg（-1）时保持了767 mAhg（-1）以上的出色可逆容量，平均库仑效率高达98.6％。即使在2000 mAg（-1）时，也可以获得高达538 mAhg（-1）的稳定容量。该电极材料的独特组成和纳米结构有助于增强电化学性能。由于易于大规模制造和优异的电化学性能，这些混合纳米线是下一代高性能LIB的有希望的阳极材料。

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