High Energy and High Power Lithium‐Ion Capacitors Based on Boron and Nitrogen Dual‐Doped 3D Carbon Nanofibers as Both Cathode and Anode |
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Authors: | Qiuying Xia Hai Yang Min Wang Mei Yang Qiubo Guo Liming Wan Hui Xia Yan Yu |
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Affiliation: | 1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China;2. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, China;3. Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, China |
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Abstract: | High energy density at high power density is still a challenge for the current Li‐ion capacitors (LICs) due to the mismatch of charge‐storage capacity and electrode kinetics between capacitor‐type cathode and battery‐type anode. In this work, B and N dual‐doped 3D porous carbon nanofibers are prepared through a facile method as both capacitor‐type cathode and battery‐type anode for LICs. The B and N dual doping has profound effect in tuning the porosity, functional groups, and electrical conductivity for the porous carbon nanofibers. With rational design, the developed B and N dual‐doped carbon nanofibers (BNC) exhibit greatly improved electrochemical performance as both cathode and anode for LICs, which greatly alleviates the mismatch between the two electrodes. For the first time, a 4.5 V “dual carbon” BNC//BNC LIC device is constructed and demonstrated, exhibiting outstanding energy density and power capability compared to previously reported LICs with other configurations. In specific, the present BNC//BNC LIC device can deliver a large energy density of 220 W h kg?1 and a high power density of 22.5 kW kg?1 (at 104 W h kg?1) with reasonably good cycling stability (≈81% retention after 5000 cycles). |
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Keywords: | boron and nitrogen dual doping carbon nanofibers high energy high power lithium‐ion capacitors |
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