期刊
SMALL
卷 13, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201700762
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资金
- National Natural Science Foundation of China [51622406, 21673298, 21473258]
- Distinguished Young Scientists of Hunan Province [13JJ1004]
- Fundamental Research Funds for the Central Universities of Central South University [2014zzts013]
- Project of Innovation-driven Plan in Central South University [2016CX020]
- National Postdoctoral Program for Innovative Talents [BX00192]
The electrochemical behaviors of current graphitic carbons are seriously restricted by its low surface area and insufficient interlayer spacing for sodium-ion batteries. Here, sulfur-doped graphitic carbon nanosheets are reported by utilizing sodium dodecyl sulfate as sulfur resource and graphitization additive, showing a controllable interlayer spacing range from 0.38 to 0.41 nm and a high specific surface area up to 898.8 m(2) g(-1). The obtained carbon exhibits an extraordinary electrochemical activity for sodium-ion storage with a large reversible capacity of 321.8 mAh g(-1) at 100 mA g(-1), which can be mainly attributed to the expanded interlayer spacing of the carbon materials resulted from the S-doping. Impressively, superior rate capability of 161.8 mAh g(-1) is reserved at a high current density of 5 A g(-1) within 5000 cycles, which should be ascribed to the fast surface-induced capacitive behavior derived from its high surface area. Furthermore, the storage processes are also quantitatively evaluated, confirming a mixed storage mechanism of diffusion-controlled intercalation behavior and surface-induced capacitive behavior. This study provides a novel route for rationally designing various carbon-based anodes with enhanced rate capability.
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