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Controlled pyrolysis of MIL-88A to Fe2O3@C nanocomposites with varied morphologies and phases for advanced lithium storage

Abstract

Carbon-coated α-Fe2O3 hollow nanospindles and varied-phase Fe2O3@C (γ-Fe2O3@C, αγ-Fe2O3@C, and α-Fe2O3@C) nanobipyramids were prepared by controlling pyrolysis of MIL-88A nanobipyramids at different temperature and time in air or nitrogen. The corresponding pyrolysis stage principle in air and self-oxidation/reduction-like mechanism in nitrogen were firstly proposed. When used as anodes for lithium-ion batteries (LIBs), the α-Fe2O3 hollow nanospindles with carbon-coated shells can not only facilitate the contact between the electrode and electrolyte, and accommodate mechanical stress and volume change over multiple cycles, but also enhance the electronic conductivity of the electrode materials. Benefiting from the unique carbon-coated hollow structure, the α-Fe2O3 nanospindle electrode deliver an over-theoretical capacity up to 1207 mAh g-1 after 200 cycles at 0.2 C and reversible lithium storage capacity as high as 961.5 mAh g-1 after 500 cycles at 1 C. Moreover, αγ-Fe2O3@C nanobipyramid electrode also exhibits a superior specific capacity of 631.6 mAh g-1 at 1 C after 150 cycles due to its derived unique nanoflake structure.

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Publication details

The article was received on 20 Sep 2017, accepted on 27 Oct 2017 and first published on 30 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08314A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Controlled pyrolysis of MIL-88A to Fe2O3@C nanocomposites with varied morphologies and phases for advanced lithium storage

    Y. Wang, X. Guo, Z. Wang, M. lv, B. Wu, Y. Wang, C. Yan, A. Yuan and H. Yang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08314A

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