期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 25, 页码 13377-13383出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta02089a
关键词
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资金
- NSFC [21173010, 21473004]
- MOST [2013CB932601]
Self-supported alpha-Fe2O3 nanorod arrays consisting of mesocrystalline nanorod bundles with tunable interstices were prepared by solution-phase growth coupled with chemical etching. The existence of acetic acid and sulfate ions in the hydrothermal system promoted the direct growth of alpha-Fe2O3 nanorod bundles with a mesocrystalline structure on a Ti substrate. The robust alpha-Fe2O3 nanorod arrays with optimized interstices are able to offer reduced lengths for electron transport and ion diffusion, and enough spaces to accommodate lithiation-induced volume expansion, leading to novel three-dimensional (3D) anodes with significantly improved rate capability and cyclability. When used as binderfree anodes for lithium ion batteries (LIBs), the alpha-Fe2O3 nanorod arrays retained a reversible capacity of 801 mA h g(-1) after 500 cycles at 5 C (namely, 5 A g(-1)), and achieved practically valuable capacities of 499 mA h g(-1) and 350 mA h g(-1) at high rates of 20 C and 30 C, respectively. Furthermore, a flexible full battery with high capacity and fast charging capability was assembled using the alpha-Fe2O3 nanorod arrays as the anode, demonstrating their potential applications in flexible electronic devices.
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