Structural and Thermodynamic Understandings in Mn-Based Sodium Layered Oxides during Anionic Redox
- Authors
- Kong, Seok Mun; Kim, Duho; Lee, Kug-Seung; Kim, Min-Seob; Jin, Aihua; Park, Jae-Hyuk; Ahn, Chi-Yeong; Jeon, Tae-Yeol; Jung, Young Hwa; Yu, Seung-Ho; Mun, Junyoung; Sung, Yung-Eun
- Issue Date
- 8월-2020
- Publisher
- WILEY
- Keywords
- anionic redox; cathodes; sodium ion batteries; two-phase reactions
- Citation
- ADVANCED SCIENCE, v.7, no.16
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED SCIENCE
- Volume
- 7
- Number
- 16
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/130548
- DOI
- 10.1002/advs.202001263
- ISSN
- 2198-3844
- Abstract
- A breakthrough utilizing an anionic redox reaction (O2-/On-) for charge compensation has led to the development of high-energy cathode materials in sodium-ion batteries. However, its reaction results in a large voltage hysteresis due to the structural degradation arising from an oxygen loss. Herein, an interesting P2-type Mn-based compound exhibits a distinct two-phase behavior preserving a high-potential anionic redox (approximate to 4.2 V vs Na+/Na) even during the subsequent cycling. Through a systematic series of experimental characterizations and theoretical calculations, the anionic redox reaction originating from O 2p-electron and the reversible unmixing of Na-rich and Na-poor phases are confirmed in detail. In light of the combined study, a critical role of the anion-redox-induced two-phase reaction in the positive-negative point of view is demonstrated, suggesting a rational design principle considering the phase separation and lattice mismatch. Furthermore, these results provide an exciting approach for utilizing the high-voltage feature in Mn-based layered cathode materials that are charge-compensated by an anionic redox reaction.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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