P2–Na2/3Mg1/4Mn7/12Co1/6O2 cathode material based on oxygen redox activity with improved first-cycle voltage hysteresis
| Autor: | Nuria Tapia-Ruiz, Cindy Soares, Peter G. Bruce, James W. Somerville, Robert A. House, Matthew R. Roberts, Juliette Billaud |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Renewable Energy Sustainability and the Environment Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Mass spectrometry Electrochemistry 01 natural sciences Redox Oxygen 0104 chemical sciences Hysteresis Transition metal chemistry Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| DOI: | 10.1016/j.jpowsour.2021.230104 |
| Popis: | The recent report of P2–Na2/3Mg0.28Mn0.72O2 (P2-NMM) demonstrated the possibility of utilizing the oxygen redox couple in a layered oxide cathode without the need for alkali ions or vacancies in the transition metal layer. In this work, we report the synthesis of a new P2-type compound, Na2/3Mg1/4Mn7/12Co1/6O2 (P2-NMMC), which exhibits reversible specific capacities as high as 173 mAh g−1 and an improvement of the first cycle voltage hysteresis over P2-NMM. The material was characterised using a combination of ex-situ and operando techniques including X-ray diffraction (XRD), differential electrochemical mass spectrometry (DEMS) and X-ray spectroscopy (XAS) to identify potential sources for this improvement. |
| Databáze: | OpenAIRE |
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