Pine-Leaf-Shaped Î±-Fe<inf>2</inf>O<inf>3</inf>Micro/Nanostructures with a Preferred Orientation along the (110) Plane for Efficient Reversible Lithium Storage
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Â© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Pine-leaf-like Î±-Fe 2 O 3 micro/nanostructures with (110)-facet orientations are prepared by a hydrothermal process using Mg 2+ as an inducer and are investigated as conversion-type anode materials for lithium-ion batteries (LIBs). The unique micro/nanostructured building blocks significantly shorten the diffusion distance for lithium ions and improve the kinetics of the lithium ion extraction/insertion process, and the unique hierarchical morphology provide buffer space for the volume change of the electrode during the chargeâ€“discharge processes. Thus, favorable performances for lithium storage are demonstrated for the micro/nanostructured Î±-Fe 2 O 3 electrodes. In addition, the facet orientation of the particles is also found to have a substantial impact on the electrode performance, and the growth of the micro/nanoparticles in a preferred orientation along the (110) plane facilitated the anisotropic diffusion of lithium ions along channels in the [1 (Formula presented.) 00] direction. From the dual benefits of the stable hierarchical micro/nanostructure and the preferred growth of the particles along the (110) plane, excellent electrochemical performance with a reversible capacity of up to 915 and 565 mA h g âˆ’1 at rates of 100 and 5000 mA g âˆ’1 , respectively, and a capacity retention of 690 mA h g âˆ’1 at 1000 mA g âˆ’1 after 200 cycles is demonstrated for the Î±-Fe 2 O 3 micro/nanostructure prepared under optimized conditions.
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