δ-MnO2 nanofibers: a promising cathode material for new aluminum-ion batteries
δ-MnO2 nanofibers, synthesized by using a simple, low-cost sol-gel method, showed high electrochemical performance as a cathode for rechargeable Al-ion batteries (AIBs). δ-MnO2 presented an initial discharge capacity of 59 mA h g−1 and stabilized at 37 mA h g−1 at a current rate of 100 mA g−1 after...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/113400 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/113400 |
| Access Level: | acceso abierto |
| Palabra clave: | 546 Aluminium-ion batteries Electrochemistry δ-MnO2 Aluminum Characterization Ciencias 23 Química |
| Sumario: | δ-MnO2 nanofibers, synthesized by using a simple, low-cost sol-gel method, showed high electrochemical performance as a cathode for rechargeable Al-ion batteries (AIBs). δ-MnO2 presented an initial discharge capacity of 59 mA h g−1 and stabilized at 37 mA h g−1 at a current rate of 100 mA g−1 after 15 cycles and for more than 100 cycles with almost a 99 % coulombic efficiency. Different plateaus in charge/discharge curves, consistent with CV peaks, revealed the Al-ion insertion/deinsertion and the electrochemical stability of the battery. Moreover, different rate CV measurements revealed the pseudocapacitive behavior of δ-MnO2 in AIBs. The obtained charge/discharge capacities are ten times higher than previous studies performed with this material. Ex situ Raman and high-resolution TEM measurements in different charge/discharge states revealed structural information of δ-MnO2 upon Al-ion intercalation/deintercalation. |
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