Carbon-coated Fe 2 O 3 hollow sea urchin nanostructures as high-performance anode materials for lithium-ion battery
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Published online 25 August 2020 | https://doi.org/10.1007/s40843-020-1437-2
Carbon-coated Fe2O3 hollow sea urchin nanostructures as high-performance anode materials for lithium-ion battery 1
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Yuge Feng , Na Shu , Jian Xie , Fei Ke , Yanwu Zhu and Junfa Zhu ABSTRACT Fe2O3 has become a promising anode material in lithium-ion batteries (LIBs) in light of its low cost, high theo−1 retical capacity (1007 mA h g ) and abundant reserves on the earth. Nevertheless, the practical application of Fe2O3 as the anode material in LIBs is greatly hindered by several severe issues, such as drastic capacity falloff, short cyclic life and huge volume change during the charge/discharge process. To tackle these limitations, carbon-coated Fe2O3 (Fe2O3@MOFC) composites with a hollow sea urchin nanostructure were prepared by an effective and controllable morphology-inherited strategy. Metal-organic framework (MOF)-coated FeOOH (FeOOH@MIL-100(Fe)) was applied as the precursor and self-sacrificial template. During annealing, the outer MOF layer protected the structure of inner Fe2O3 from collapsing and converted to a carbon coating layer in situ. When applied as anode materials in LIBs, Fe2O3@MOFC composites showed an initial discharge −1 capacity of 1366.9 mA h g and a capacity preservation of −1 1551.3 mA h g after 200 cycles at a current density of −1 −1 0.1 A g . When increasing the current density to 1 A g , a −1 reversible and high capacity of 1208.6 mA h g was obtained. The enhanced electrochemical performance was attributed to the MOF-derived carbon coating layers and the unique hollow sea urchin nanostructures. They mitigated the effects of volume expansion, increased the lithium-ion mobility of electrode, and stabilized the as-formed solid electrolyte interphase films. Keywords: lithium-ion battery, transition metal oxide, MOFderived carbon, anode, hollow sea urchin nanostructures
INTRODUCTION Lithium-ion batteries (LIBs) have been widely used as
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electrochemical energy storage devices [1,2]. With more rigorous requirements for improved electrochemical energy storage devices, it is essential to develop safe and low-cost LIBs with high power density and long lifetime [3,4]. Transition metal oxides (TMOs) are promising anode materials for LIBs due to their higher theoretical capa−1 cities (500–1000 mA h g ) than conventional graphite −1 electrode (372 mA h g ) [5,6]. Among various TMOs, Fe2O3 is the most attractive anode material for LIBs, because of its low cost and high theoretical capacity −1 (1007 mA h g ) [7]. However, some serious issues limit its practical application in LIBs. For example, slow transmission of lithium ions and electrons in active substances results in poor rate performance [8,9]. Another severe problem is dramatic capacity fading, which is caused by the formation of irreversible solid electrolyte interphase (SEI), harsh aggregation and huge volume change during the charge/discharge process [10–12]. Various efforts have been made to tackle these problems: one could coat or hybridize iron oxi
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