Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 37, Pages 21336-21344Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b05443
Keywords
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Funding
- National Natural Science Foundation of China [51577094, 21503112]
- Natural Science Foundation of Jiangsu Province of China [BK20140915]
- Scientific Research Foundation for Advanced Talents of Nanjing Normal University [2014103XGQ0073]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
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In contrast to the extensive investigation of the electrochemical performance of conventional carbon materials in sodium-ion batteries, there has been scarcely any study of sodium storage property of fluorine-doped carbon. Here we report for the first time the application of fluorine-doped carbon particles (F-CP) synthesized through pyrolysis of lotus petioles as anode materials for sodium-ion batteries. Electrochemical tests demonstrate that the F-CP electrode delivers an initial charge capacity of 230 mA h g(-1) at a current density of 50 mA g(-1) between 0.001 and 2.8 V, which greatly outperforms the corresponding value of 149 mA h g(-1) for the counterpart banana peels-derived carbon (BPC). Even under 200 mA g(-1), the F-CP electrode could still exhibit a charge capacity of 228 mA h with initial charge capacity retention of 99.1% after 200 cycles compared to the BPC electrode with 107 mA h g(-1) and 71.8%. The F-doping and the large interlayer distance as well as the disorder structure contribute to a lowering of the sodium ion insertion-extraction barrier, thus promoting the Na+ diffusion and providing more active sites for Na+ storage. In specific, the F-CP electrode shows longer low-discharge-plateau and better kinetics than does the common carbon-based electrode. The unique electrochemical performance of F-CP enriches the existing knowledge of the carbon-based electrode materials and broadens avenues for rational design of anode materials in sodium-ion batteries.
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