Insights into the Performance Degradation of Oxygen-Type Manganese-Rich Layered Oxide Cathodes for High-Voltage Sodium-Ion Batteries
| Autor: | Fangmin Guo, Khalil Amine, Xiaoqiao Zeng, Tianyuan Ma, Hsien-Hau Wang, Chi-Cheung Su, Jacob Jorne, Zonghai Chen, Yan Li, Ronghui Kou, Yang Ren, Wenjuan Liu Mattis, Boao Song, Cheng-Jun Sun, Gui-Liang Xu, Steve M. Heald, Reza Shahbazian-Yassar |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Sodium Stacking Energy Engineering and Power Technology chemistry.chemical_element High voltage Manganese Electrochemistry Cathode law.invention chemistry Chemical engineering law Materials Chemistry Chemical Engineering (miscellaneous) Degradation (geology) Electrical and Electronic Engineering Stoichiometry |
| Zdroj: | ACS Applied Energy Materials. |
| ISSN: | 2574-0962 |
| Popis: | The cost of batteries is becoming as important as the energy density for large-scale electrochemical energy storage application. Sodium manganese-rich layered oxides (P-type and O-type) are thus one of the promising cathode materials for rechargeable batteries because of the relatively low cost of manganese and sodium. The O-type cathodes are more promising for practical application owing to their high sodium-ion stoichiometry. However, most of these materials suffer from rapid capacity decay during high-voltage cycling. Herein, we used synchrotron X-ray probes coupled with electrochemical techniques to disclose the structural evolution of α-NaMnO2 during solid-state synthesis and electrochemical cycling. During high-voltage cycling, a substantial increase of interfacial microstrain from both stacking faults and Mn cation migration was found to pin down this material’s layered structures and simultaneously block the diffusion pathways of Na+, thus leading to the performance degradation. The findings prese... |
| Databáze: | OpenAIRE |
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