Understanding the effect of Nb substitution on Li-Mn-rich layered oxides
| Autor: | Vassilios Siozios, Jun Wang, Yong Yang, Jie Li, Jan-Paul Brinkmann, Martin Winter, Uta Rodehorst |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Kinetics Substitution (logic) chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Oxygen 0104 chemical sciences chemistry Chemical engineering Transition metal Phase (matter) ddc:540 Lithium Thermal stability 0210 nano-technology |
| Zdroj: | Electrochimica acta 390, 138801-(2021). doi:10.1016/j.electacta.2021.138801 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2021.138801 |
| Popis: | Substitution with 4d/5d-elements has been recently established as promising solution for suppressing capacity and voltage fading in Li-Mn-rich layered oxide cathodes for lithium ion batteries. This study aims at understanding of the underlying working principles of this concept through a systematic study on an Nb substituted Co-free material, i.e. Li1.2Ni0.2Mn0.6O2. Nb is confirmed by XRD to be located at the position of Li in the transition metal layer of the C/2 m phase of the composite material thereby increasing the kinetics of activation significantly. Due to substitution, the material experiences a lager extent of reversible anionic redox activity while it also gains an increased thermal stability and shows less oxygen loss than the pristine material during cycling. In addition, substitution also improves the electrochemical performance by increasing the energy efficiency of the material. This study provides insights into the effects of Nb substitution and could be a useful guide for the study of other substitution elements and the ongoing improvement of Li-Mn-rich layered oxide cathodes. |
| Databáze: | OpenAIRE |
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