Selective formation of pyridinic-type nitrogen-doped graphene and its application in lithium-ion battery anodes
| Autor: | Kimberly A. See, Deepan Kishore Kumar, Nai-Chang Yeh, Jacob D. Bagley |
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| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
Materials science Graphene General Chemical Engineering Doping technology industry and agriculture 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Lithium-ion battery 0104 chemical sciences law.invention Anode symbols.namesake Chemical engineering X-ray photoelectron spectroscopy law symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | RSC advances. 10(65) |
| ISSN: | 2046-2069 |
| Popis: | We report a high-yield single-step method for synthesizing nitrogen-doped graphene nanostripes (N-GNSPs) with an unprecedentedly high percentage of pyridinic-type doping (>86% of the nitrogen sites), and investigate the performance of the resulting N-GNSPs as a lithium-ion battery (LIB) anode material. The as-grown N-GNSPs are compared with undoped GNSPs using scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), helium ion-beam microscopy (HIM), and electrochemical methods. As an anode material we find that pyridinic-type N-GNSPs perform similarly to undoped GNSPs, suggesting that pyridinic sites alone are not responsible for the enhanced performance of nitrogen-doped graphene observed in previous studies, which contradicts common conjectures. In addition, post-mortem XPS measurements of nitrogen-doped graphene cycled as a lithium-ion battery anode are conducted for the first time, which reveal direct evidence for irreversible chemical changes at the nitrogen sites during cycling. These findings therefore provide new insights into the mechanistic models of doped graphene as LIB anodes, which are important in improving the anode designs for better LIB performance. |
| Databáze: | OpenAIRE |
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