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Large Interlayer Distance and Heteroatom-Doping of Graphite Provide New Insights into the Dual-Ion Storage Mechanism in Dual-Carbon Batteries |
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| Authors: | Xin Hu Prof. Yitian Ma Wenjie Qu Prof. Ji Qian Yuetong Li Yi Chen Anbin Zhou Huirong Wang Fengling Zhang Zhengqiang Hu Yongxin Huang Li Li Feng Wu Renjie Chen |
| Affiliation: | 1. Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China;2. School of Materials, Xi'an University of Science and Technology, Xi'an, 710054 China;3. Shanghai Institute of Space Power-Sources, Shanghai, 200245 China;4. Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 China;5. Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 China Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081 China |
| Abstract: | Dual-ion batteries (DIBs) is a promising technology for large-scale energy storage. However, it is still questionable how material structures affect the anion storage behavior. In this paper, we synthesis graphite with an ultra-large interlayer distance and heteroatomic doping to systematically investigate the combined effects on DIBs. The large interlayer distance of 0.51 nm provides more space for anion storage, while the doping of the heteroatoms reduces the energy barriers for anion intercalation and migration and enhances rapid ionic storage at interfaces simultaneously. Based on the synergistic effects, the DIBs composed of carbon cathode and lithium anode afford ultra-high capacity of 240 mAh g−1 at current density of 100 mA g−1. Dual-carbon batteries (DCBs) using the graphite as both of cathode and anode steadily cycle 2400 times at current density of 1 A g−1. Hence, this work provides a reference to the strategy of material designs of DIBs and DCBs. |
| Keywords: | Dual-Ion Batteries Graphite Heteroatomic Doping Ultra-Large Interlayer Distance |