Mesoporous carbon nanosheet-assembled flowers towards superior potassium storage |
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| Authors: | Xianghua Zhang Dong Chen Yanping Zhou Dan Yang Weiling Liu Yuezhan Feng Xianhong Rui Yan Yu |
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| Institution: | 1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China;3. Hefei National Laboratory for Physical Sciences at the Microscale, Department of Materials Science and Engineering, Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), University of Science and Technology of China, Hefei 230026, China;4. Dalian National Laboratory for Clean Energy (DNL), Chinese Academy of Sciences, Dalian 116023, China;5. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;6. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;7. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou 450002, China |
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| Abstract: | Potassium-ion batteries (PIBs) are attracted tremendous interest for large-scale energy storage systems (ESSs) owing to their economic merits. However, the main challenges of the PIBs are sluggish K-ion diffusion and large volume variations in the potassium repeated intercalation/deintercalation. Herein, mesoporous carbon nanosheet-assembled flowers (abbreviated as F-C) are designed as an original anode for superior-performance PIBs. Specifically, the F-C anode exhibits a high K-storage capacity (e.g., 381 mAh/g at 50 mA/g during the 2nd cycle), excellent rate performance (e.g., 101 mAh/g at 2.0 A/g) and superior long cycle capability. Such excellent K-ion storage property is largely benefited from the large surface area (～141 m2/g) and reasonable pore volume (0.465 cm3/g), which not only stimulates rapid K-ions diffusion and relieves the huge volume strain, but also exposes extensive active sites for K-ion capacitive storage. |
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| Keywords: | Potassium-ion battery Anode material Mesoporous carbon Nanosheet-assembled flowers High-rate capability |
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