A Layered–Tunnel Intergrowth Structure for High‐Performance Sodium‐Ion Oxide Cathode |
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| Authors: | Yao Xiao Peng‐Fei Wang Ya‐Xia Yin Yan‐Fang Zhu Xinan Yang Xu‐Dong Zhang Yuesheng Wang Xiao‐Dong Guo Ben‐He Zhong Yu‐Guo Guo |
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| Institution: | 1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, P. R. China;2. College of Chemical Engineering, Sichuan University, Chengdu, P. R. China;3. University of Chinese Academy of Sciences, Beijing, P. R. China;4. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, Australia;5. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing, China |
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| Abstract: | Delivery of high‐energy density with long cycle life is facing a severe challenge in developing cathode materials for rechargeable sodium‐ion batteries (SIBs). Here a composite Na0.6MnO2 with layered–tunnel structure combining intergrowth morphology of nanoplates and nanorods for SIBs, which is clearly confirmed by micro scanning electron microscopy, high‐resolution transmission electron microscopy as well as scanning transmission electron microscopy with atomic resolution is presented. Owing to the integrated advantages of P2 layered structure with high capacity and that of the tunnel structure with excellent cycling stability and superior rate performance, the composite electrode delivers a reversible discharge capacity of 198.2 mAh g?1 at 0.2C rate, leading to a high‐energy density of 520.4 Wh kg?1. This intergrowth integration engineering strategy may modulate the physical and chemical properties in oxide cathodes and provide new perspectives on the optimal design of high‐energy density and high‐stable materials for SIBs. |
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| Keywords: | cathodes electrochemistry layered oxides sodium‐ion batteries tunnel |
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