Research Library

open-access-imgOpen AccessStructural and Thermodynamic Understandings in Mn‐Based Sodium Layered Oxides during Anionic Redox
Kang Seok Mun,
Kim Duho,
Lee KugSeung,
Kim MinSeob,
Jin Aihua,
Park JaeHyuk,
Ahn ChiYeong,
Jeon TaeYeol,
Jung Young Hwa,
Yu SeungHo,
Mun Junyoung,
Sung YungEun
Publication year2020
Publication title
advanced science
Resource typeJournals
Abstract A breakthrough utilizing an anionic redox reaction (O 2− /O n− ) 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.
Subject(s)cathode , chemical physics , chemistry , half reaction , inorganic chemistry , ion , materials science , organic chemistry , phase (matter) , redox , sodium
Keyword(s) anionic redox , cathodes , sodium ion batteries , two‐phase reactions
SCImago Journal Rank5.388

Seeing content that should not be on Zendy? Contact us.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here