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Stable Lithium Storage in Nitrogen-Doped Carbon-Coated Ferric Oxide Yolk-Shell Nanospindles with Preserved Hollow Space
ChemPlusChem 83(3):99-107 Mar 2018

Zhang, Bao-Lin; Xin, Sen; Qin, Haili; Cong, Huai-Ping; Yu, Shu-Hong

Iron oxide (Fe2O3) is a promising anode material for next‐generation high‐energy lithium‐ion batteries owing to its high theoretical specific capacity, but it suffers from unstable electrochemistry, as represented by a significant volume variation upon (de)lithiation and unstable solid–electrolyte interface. To target these issues, a double‐coating synthetic route has been developed to prepare a yolk–shell‐structured γ‐Fe2O3/nitrogen‐doped carbon composite, in which spindle‐like γ‐Fe2Ocores are encapsulated in the highly conductive carbon shell. Through precisely controlling the void space between the γ‐Fe2Ocore and the carbon shell, volume variation in γ‐Fe2O3 during (de)lithiation is well accommodated, while the composite maintains an intact and relatively dense structure, which stabilizes the solid–electrolyte interface and is beneficial for improving the practical energy density of the material. With a stabilized (de)lithiation electrochemistry and a synergistic storage effect between the two active components, the composite enables excellent lithium storage performance, in terms of reversible capacity, cycling ability, and rate capability.

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