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Structural and Thermodynamic Understandings in Mn-Based Sodium Layered Oxides during Anionic Redox

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Title
Structural and Thermodynamic Understandings in Mn-Based Sodium Layered Oxides during Anionic Redox
Author(s)
Seok Mun Kang; Kim D.; Lee K.-S.; Min‐Seob Kim; Jin A.; Jae‐Hyuk Park; Chi‐Yeong Ahn; Jeon T.-Y.; Jung Y.H.; Yu S.-H.; Mun J.; Yung‐Eun Sung
Subject
anionic redox, ; cathodes, ; sodium ion batteries, ; two-phase reactions
Publication Date
2020-08
Journal
ADVANCED SCIENCE, v.7, no.16, pp.2001263
Publisher
WILEY
Abstract
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimA 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 (≈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
URI
https://pr.ibs.re.kr/handle/8788114/7712
DOI
10.1002/advs.202001263
ISSN
2198-3844
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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