期刊
NANO-MICRO LETTERS
卷 6, 期 4, 页码 307-315出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-014-0003-7
关键词
Cobalt ferrite; Graphene; Anode materials; Lithium ion battery
资金
- Program of National Natural Science Foundation of China [21071097, 20901050]
- National Basic Research Program of China [2014CB239700]
- Shanghai Nano-Project [12 nm0503502]
- Minhang District Developing Project
CoFe2O4-graphene nanosheets (CoFe2O4-GNSs) were synthesized through an ultrasonic method, and their electrochemical performances as Li-ion battery electrode were improved by annealing processes. The nanocomposites obtained at 350 degrees C maintained a high specific capacity of 1,257 mAh g(-1) even after 200 cycles at 0.1 A g(-1). Furthermore, the obtained materials also have better rate capability, and it can be maintained to 696, 495, 308, and 254 mAh g(-1) at 1, 2, 5, and 10 A g(-1), respectively. The enhancements realized in the reversible capacity and cyclic stability can be attributed to the good improvement in the electrical conductivity achieved by annealing at appropriate temperature, and the electrochemical nature of CoFe2O4 and GNSs during discharge-charge processes.
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