期刊
APPLIED SURFACE SCIENCE
卷 347, 期 -, 页码 178-185出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2015.04.074
关键词
Carbon coated Fe2O3 nanocrystals; Lithium ion batteries; Anode; Hydrothermal synthesis; Heat treatment
类别
资金
- National Natural Science Foundation of China [51422104, 51472177]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201145]
- Program for New Century Excellent Talents in University [NCET-12-0408]
- China-EU Science and Technology Cooperation Project [1206]
Homogeneous and highly crystalline Fe2O3 nanocrystals (similar to 8 nm) embedded in interconnected carbon nanospheres (similar to 50 nm) (Fe2O3@C) have been fabricated by one-step hydrothermal reaction followed by annealing with Ar. When used as the anode materials for lithium-ion batteries, the Fe2O3@C nano spheres with 55.24 wt% Fe2O3 deliver high reversible lithium storage capacity (826 mAh/g at 0.1 A/g after 20 cycles), high Coulombic efficiency (similar to 99%) and good cycling stability, which are much better than that of commercial Fe2O3 nanoparticles. These excellent electrochemical performances could be attributed to the robust and high-conducting interconnected carbon nanospheres embedded with a mass of small Fe2O3 nanocrystals, which not only can offer large quantity of accessible active sites for lithium-ion reaction as well as good conductivity and short diffusion length for electron and ion transport, but also can effectively suppress the aggregation and buffer the volume expansion of Fe2O3 nanocrystals during the repeated lithiation and delithiation processes. (C) 2015 Elsevier B.V. All rights reserved.
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