Role of transition metals in a charge transfer mechanism and oxygen removal in Li1.17Ni0.17Mn0.5Co0.17O2: experimental and first-principles analysis
| Autor: | Mridula Dixit Bharadwaj, Annigere S. Prakash, Tanmay Sarkar, Kunkanadu R. Prakasha |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Oxide General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Redox Effective nuclear charge 0104 chemical sciences chemistry.chemical_compound chemistry Chemical physics Density functional theory Lithium Physical and Theoretical Chemistry Cyclic voltammetry 0210 nano-technology Oxygen binding |
| Zdroj: | Physical Chemistry Chemical Physics. 20:19606-19613 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c8cp03148g |
| Popis: | Oxygen removal from high capacity Li-rich layered oxide Li1.17Ni0.17Mn0.5Co0.17O2 affects the charge transfer process during cycling. During de-lithiation, oxygen removal takes place with the reduction in oxygen binding energy. Co substitution affects oxygen removal by shifting the O-p orbital closer to the Fermi energy. A convex hull plot is used to analyse single-phase and two-phase reactions during de-lithiation in Li1.17Ni0.17Mn0.5Co0.17O2 and Li2MnO3. Experimentally, the single-phase and two-phase reactions are identified based on the characteristics of the charge curve. In the charge transfer process more than 80% of lithium charge is transferred to oxygen in both the compounds. Effective charge and cyclic voltammetry reveal the redox centers in the compounds which help to understand the role of oxygen and transition metals in de-lithiation. A detailed explanation of oxygen removal and the charge transfer mechanism of Li1.17Ni0.17Mn0.5Co0.17O2 and Li2MnO3 is provided in the current experimental and density functional theory based study. |
| Databáze: | OpenAIRE |
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