Journal
ELECTROCHIMICA ACTA
Volume 90, Issue -, Pages 492-497Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.11.105
Keywords
Nitrogen-doped; Graphene sheets; Anode material; Lithium-ion batteries
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Funding
- National Natural Science Foundation of China [20936001]
- Fundamental Research Funds for the Central Universities, SCUT [2009220038]
- Cooperation Project in Industry, Education and Research of Guangdong Province
- Ministry of Education of China [2010B090400518]
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A new facile approach is proposed to synthesize nitrogen-doped graphene sheets with the nitrogen-doping level as high as 7.04 at.% by thermal annealing pristine graphene sheets and low-cost industrial material melamine. The high-level nitrogen-doped graphene sheets exhibit a superhigh initial reversible capacity of 1123 mAh g(-1) at a current density of 50 mA g(-1). More significantly, even at an extremely high current density of 20 A g(-1), highly stable capacity of about 241 mAh g(-1) could still be obtained. Such an electrochemical performance is superior to those previously reported nitrogen-doped graphene sheets. The excellent electrochemical performance can be attributed to the two-dimensional structure, disordered surface morphology, high nitrogen-doping level, and the existence of pyridinic nitrogen atoms. The results indicate that the high-level nitrogen-doped graphene sheets could be a promising anode material for high-performance lithium-ion batteries. (C) 2012 Elsevier Ltd. All rights reserved.
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