Ever‐Increasing Pseudocapacitance in RGO–MnO–RGO Sandwich Nanostructures for Ultrahigh‐Rate Lithium Storage |
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| Authors: | Tianzhi Yuan Yinzhu Jiang Wenping Sun Bo Xiang Yong Li Mi Yan Ben Xu Shixue Dou |
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| Affiliation: | 1. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province and School of Materials Science and Engineering, Zhejiang University, Hangzhou, China;2. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, Australia;3. Smart Materials and Surfaces Lab, Mechanical Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, UK |
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| Abstract: | Lithium ion batteries have attained great success in commercialization owing to their high energy density. However, the relatively delaying discharge/charge severely hinders their high power applications due to intrinsically diffusion‐controlled lithium storage of the electrode. This study demonstrates an ever‐increasing surface redox capacitive lithium storage originating from an unique microstructure evolution during cycling in a novel RGO–MnO–RGO sandwich nanostructure. Such surface pseudocapacitance is dynamically in equilibrium with diffusion‐controlled lithium storage, thereby achieving an unprecedented rate capability (331.9 mAh g?1 at 40 A g?1, 379 mAh g?1 after 4000 cycles at 15 A g?1) with outstanding cycle stability. The dynamic combination of surface and diffusion lithium storage of electrodes might open up possibilities for designing high‐power lithium ion batteries. |
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| Keywords: | anode high‐rate battery lithium storage MnO pseudocapacitance |
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