Tianjin EV Energies Company Ltd Tianjin 300380 China

China

Tianjin EV Energies Company Ltd Tianjin 300380 China

China
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Zou G.,Central South University | Wang C.,University of Electronic Science and Technology of China | Hou H.,Central South University | Wang C.,Tianjin EV Energies Company Ltd Tianjin 300380 China | And 2 more authors.
Small | Year: 2017

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 m2 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. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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