Structural Engineering of Multishelled Hollow Carbon Nanostructures for High‐Performance Na‐Ion Battery Anode |
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| Authors: | De‐Shan Bin Yunming Li Yong‐Gang Sun Shu‐Yi Duan Yaxiang Lu Jianmin Ma An‐Min Cao Yong‐Sheng Hu Li‐Jun Wan |
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| Institution: | 1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, P. R. China;2. University of Chinese Academy of Sciences, Beijing, P. R. China;3. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China;4. School of Physics and Electronics, Hunan University, Changsha, China |
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| Abstract: | Hard carbon has long been considered the leading candidate for anode materials of Na‐ion batteries. Intensive research efforts have been carried out in the search of suitable carbon structure for an improved storage capability. Herein, an anode based on multishelled hollow carbon nanospheres, which are able to deliver an outstanding electrochemical performance with an extraordinary reversible capacity of 360 mAh g?1 at 30 mA g?1, is designed. An interesting dependence of the electrochemical properties on the multishelled structural features is identified: with an increase in the shell number of the model carbon materials, the sloping capacity in the charge/discharge curve remains almost unchanged while the plateau capacity continuously increases, suggesting an adsorption‐filling Na‐storage mechanism for the multishelled hollow hard carbon materials. The findings not only provide new perspective in the structural design of high‐performance anode materials, but also shed light on the complicated mechanism behind Na‐storage by hard carbon. |
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| Keywords: | hard carbon anodes hollow carbon nanospheres Na‐ion batteries Na‐storage mechanism |
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