High Rate Capability of Hydrogen Annealed Iron Oxide-Single Walled Carbon Nanotube Hybrid Films for Lithium-Ion Batteries

被引：21

作者：

Cao, Zeyuan ^{[1
]}

Wei, Bingqing ^{[1
]}

机构：

[1] Univ Delaware, Dept Mech Engn, Newark, DE 19716 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 20期

基金：

美国国家科学基金会;

关键词：

hydrogen annealing iron oxides; single-walled carbon nantube; hybrid films; lithium-ion batteries; electrochemical kinetics; HIGH-CAPACITY; ANODE; INTERCALATION; ELECTRODE; FE3O4; CO3O4;

D O I：

10.1021/am403028z

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A facile and effective hydrogen annealing method has been demonstrated to synthesize iron oxide/SWNT hybrid films involving the thermal reduction of rhombohedral Fe2O3 to cubic Fe3O4 through the phase transformation while maintaining the morphological integrity of the films. The poor rate capability and cyclic stability of the original alpha-Fe2O3/SWNT hybrid films have been significantly improved by H-2 annealing. The prepared iron oxide/SWNT hybrid films have a high capacity of 786 mA h g(-1) at a high current density of 4 A g(-1) with a prolonged lifetime. The enhancement of the electrochemical performance is attributed to the presence of highly conductive Fe3O4, accelerated charge-transfer kinetics, and the increased Li+ diffusivity confirmed by electrochemical impedance spectra and galvanostatic intermittent titration.

引用

页码：10246 / 10252

页数：7

共 23 条

[1] Lithium-ion intercalation into TiO2-B nanowires [J].