Research Article

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2017, 10(9): 2923–2933

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https://doi.org/10.1007/s12274-017-1502-x

Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles as high-performance Li-ion battery anodes

Wen Qi1, Xuan Li2, Hui Li3, Weikang Wu3, Pei Li2, Ying Wu1, Chunjiang Kuang1, Shaoxiong Zhou1 (*), and Xiaolin Li4 (*)

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1 Beijing Key Laboratory of Energy Nanomaterials, Advance Technology & Materials Co., Ltd, China Iron & Steel Research Institute Group, Beijing 100081, China
2 School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
3 Key Laboratory for LiquidSolid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
4 Department of Stationary Energy Storage, Pacific Northwest National Laboratory, Richland, Washington 99354, USA

Keywords: N-doped graphene, iron oxides, self-assembly, Li-ion battery, density functional theory
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ABSTRACT Iron oxides have attracted considerable interest as abundant materials for high-capacity Li-ion battery anodes. However, their fast capacity fading owing to poorly controlled reversibility of the conversion reactions greatly hinders their application. Here, a sandwich-structured nanocomposite of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles were developed as high-performance Li-ion battery anode. N-doped graphene serves as a conducting framework for the self-assembled structure and controls Fe3O4 nucleation through the interaction of N dopants, surfactant molecules, and iron precursors. Fe3O4 nanoparticles were well dispersed with a uniform diameter of ~15 nm. The unique sandwich structure enables good electron conductivity and Li-ion accessibility and accommodates a large volume change. Hence, it delivers good cycling reversibility and rate performance with a capacity of ~1,227 mA·h·g–1 and 96.8% capacity retention over 1,000 cycles at a current density of 3 A·g–1. Our work provides an ideal structure design for conversion anodes or other electrode materials requiring a large volume change.
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Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles as high-performance Li-ion battery anodes. Nano Res. 2017, 10(9): 2923–2933 https://doi.org/10.1007/s12274-017-1502-x

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