Anomalous Enhancement of Li‐O 2 Battery Performance with Li 2 O 2 Films Assisted by NiFeO x Nanofiber Catalysts: Insights into Morphology Control
| Autor: | Zhenglong Xu, Biao Zhang, Lei Qin, Zhaowen Bai, Jiaqiang Huang, Zoya Sadighi, Jang Kyo Kim, Tong-Yi Zhang, Ruiqiang Guo, Baoling Huang, Guohua Chen |
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| Rok vydání: | 2016 |
| Předmět: |
Battery (electricity)
Materials science Nucleation Nanotechnology 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Catalysis Biomaterials Chemical engineering Nanofiber Electrode Crystallite 0210 nano-technology |
| Zdroj: | Advanced Functional Materials. 26:8290-8299 |
| ISSN: | 1616-3028 1616-301X |
| Popis: | It is generally understood that particle-shaped Li2O2 is preferred in Li-O2 batteries (LOBs) because the dominance of Li2O2 films may lead to poor electrochemical performance. The influence of Li2O2 morphology and its nucleation mechanism are probed by experiments along with the first-principle calculations. It is revealed that the LOBs with Li2O2 films deliver unexpectedly improved capacities, longer cycles, and significantly reduced overpotentials assisted by NiFeOx nanofiber catalysts. The energetically favored Li 2a vacancies under LiO2-rich conditions, small crystallites, and large contact areas with the electrode/electrolyte explain the anomalous performance enhancement. Li2O2 films are formed by a heterogeneous nucleation mechanism and the voltage applied, electrolyte, electrode surface, and use of catalysts are identified as the parameters controlling the mechanisms. The mapped correlations among these parameters shed light on the control of Li2O2 morphology for developing high-performance LOBs. |
| Databáze: | OpenAIRE |
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