title: Three-dimensional Fe2 N@C microspheres grown on reduced graphite oxide for lithium-ion batteries and the Li storage mechanism.
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 Fe2 N@C microspheres grown on reduced graphite oxide (denoted as Fe2 N@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 Fe2 N@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 Fe2 N and Fe2 N-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 Fe2 N 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 Fe2 N@C-RGO during the charge/discharge processes.
authors: 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.
authors: Peng
authors: P
authors: Yu
authors: Lei
authors: L
authors: Wang
authors: Fanfei
authors: F
authors: Sun
authors: Dongdong
authors: D
authors: Zhao
authors: Chungui
authors: C
authors: Tian
authors: Lu
authors: L
authors: Zhao
authors: Xu
authors: X
authors: Liu
authors: Jianqiang
authors: J
authors: Wang
authors: Honggang
authors: H
authors: Fu
keywords: anodes; graphite; iron; lithium-ion batteries; nitrides