Rate dependent structural changes, cycling stability, and Li-ion diffusivity in a layered–layered oxide cathode material after prolonged cycling
| Autor: | Wanwisa Limphirat, Sutham Srilomsak, Songyoot Kaewmala, Pimpa Limthongkul, Jeffrey Nash, Visittapong Yordsri, Nonglak Meethong, Aniwat Kesorn |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Diffusion Spinel Oxide 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Thermal diffusivity Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention chemistry.chemical_compound Chemical engineering chemistry law Electrode engineering General Materials Science 0210 nano-technology Cycling |
| Zdroj: | Journal of Materials Chemistry A. 9:14004-14012 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Li-Rich layered oxide (LLO) cathode materials, xLi2MnO3·(1 − x)LiCoO2 (0 < x < 1, M = Mn, Ni, Co, etc.) are considered promising cathode materials in Li-ion batteries for large scale applications. This is because they provide high specific capacities of up to 250 mA h g−1. An electrode material with high energy density and high rate capability (fast charging) is required in EVs to enhance mileage and reduce charging time, respectively. The fast-charging capability of Li-ion batteries is largely determined by the electrochemical kinetic behaviors of their electrodes. Therefore, a deeper understanding about the relationship between cycling rate, structural stability, cyclability, and Li-ion diffusivity behaviors of electrode materials is a critical key to explore high-performance electrode materials for EVs and other high rate applications. In this work, the effects of cycling rates on the structural changes, cycling stability and Li-ion diffusion coefficients of a 0.5Li2MnO3·0.5LiCoO2 material were investigated. The results show that the activation of the Li2MnO3 component was controlled by the cycling rate. A high cycling rate effectively reduced the Li2MnO3 activation and spinel phase evolution, bringing about better cycling stability, and faster Li-ion diffusion after prolonged cycling. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|