题目：

γ‑Fe2O3@CNTs Anode Materials for Lithium Ion Batteries Investigated by Electron Energy Loss Spectroscopy

作者：

Xiaoxin Lv,^† Jiujun Deng,^† Biqiong Wang,^‡,§ Jun Zhong,^† Tsun-Kong Sham,^§ Xuhui Sun,^*,† and Xueliang Sun^*,‡

单位：

^†Soochow University-Western University Centre for Synchrotron Radiation Research, Institute of Functional Nano and Soft Materials Laboratory (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China

^‡Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON N6A 5B9, Canada

§Department of Chemistry, University of Western Ontario, London, ON N6A 5B7, Canada

摘要：

Atomic layer deposition was employed to deposit maghemite (γ-Fe₂O₃) nanoparticles on carbon nanotubes(CNTs) to prepare the γ-Fe₂O₃@CNTs composites, which exhibit a superior lithium storage performance as the anode of lithium ion batteries (LIBs). The high reversible capacity of 859.7 mA h/g was observed after 400 cycles at a current density of 500 mA/g. Even at the high current density of 10000 mA/g, the specific cyclic capacity of 464.4 mA h/g can still be obtained. Furthermore, electron energy loss spectroscopy results reveal that the Fe chemical state plays a critical role in the evolution of the capacity of γ-Fe₂O₃@CNTs composite anodes during the cycling process. The incomplete conversion of the chemical state in γ-Fe₂O₃ reduces the capacity, while the recovery of the chemical state of γ-Fe₂O₃ during the cycling process may cause the increase in capacity. This work provides insight into understanding the detailed working mechanism of transition metal oxides in LIBs, which helps in the design of electrode materials with promising lithium storage performance.

影响因子：

9.466

分区情况：

一区

链接：

http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.6b05356