Three‐Dimensional Fe2N@C Microspheres Grown on Reduced Graphite Oxide for Lithium‐Ion Batteries and the Li Storage Mechanism |
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| Authors: | Dr Peng Yu Dr Lei Wang Dr Fanfei Sun Dr Dongdong Zhao Dr Chungui Tian Dr Lu Zhao Xu Liu Prof Jianqiang Wang Prof Honggang Fu |
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| Affiliation: | 1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P. R. China), Fax: (+86)?451‐8666‐1259;2. Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204 (P. R. China) |
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| Abstract: | Nanostructured iron compounds as lithium‐ion‐battery anode material have attracted considerable attention with respect to improved electrochemical energy storage and excellent specific capacity, so lots of iron‐based composites have been developed. Herein, a novel composite composed of three‐dimensional Fe2N@C microspheres grown on reduced graphite oxide (denoted as Fe2N@C‐RGO) has been synthesized through a simple and effective technique assisted by a hydrothermal and subsequent heating treatment process. As the anode material for lithium‐ion batteries, the synthetic Fe2N@C‐RGO displayed excellent Li+‐ion storage performance with a considerable initial capacity of 847 mAh g?1, a superior cycle stability (a specific discharge capacity of 760 mAh g?1 remained after the 100th cycle), and an improved rate‐capability performance compared with those of the pure Fe2N and Fe2N‐RGO nanostructures. The good performance should be attributed to the existence of RGO layers that can facilitate to enhance the conductivity and shorten the lithium‐ion diffusion path; in addition, the carbon layer on the surface of Fe2N can avert the structure decay caused by the volume change during the lithiation/delithiation process. Moreover, in situ X‐ray absorption fine‐structure analysis demonstrated that the excellent performance can be attributed to the lack of any obvious change in the coordination geometry of Fe2N@C‐RGO during the charge/discharge processes. |
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| Keywords: | anodes graphite iron lithium‐ion batteries nitrides |
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