Controlling Interlayer Disorder Toward Reversible Phase Transition in a Layered Sodium Manganese Oxide Cathode DOI

Seongkoo Kang,

Jihyun Kim,

Youngju Choi

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 17, 2025

Sodium manganese oxides are promising Na-ion battery cathodes but they suffer from irreversible phase transitions during electrochemical reactions. Most strategies to date have aimed suppress the by stabilizing their layered structures through limiting content of extractable Na+. Here, we conversely increase atomic disorder in Na-birnessite, a sodium oxide, and thereby modulate its transition behavior toward improved reversibility. Our study reveals that Mn vacancies migrated into interlayer affect local environment Na+ water molecules consequently enhancing mobility. We observe better capacity retention for disordered "D-Na-birnessite", which undergoes reversible birnessite-type structure an O′3-type α-NaxMnO2-like another intermediate metastable phase. This research highlights positive effects regulate routes achieving superior reversibility, finally paving way overcoming limits oxide cathodes.

Language: Английский

Controlling Interlayer Disorder Toward Reversible Phase Transition in a Layered Sodium Manganese Oxide Cathode DOI

Seongkoo Kang,

Jihyun Kim,

Youngju Choi

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 17, 2025

Sodium manganese oxides are promising Na-ion battery cathodes but they suffer from irreversible phase transitions during electrochemical reactions. Most strategies to date have aimed suppress the by stabilizing their layered structures through limiting content of extractable Na+. Here, we conversely increase atomic disorder in Na-birnessite, a sodium oxide, and thereby modulate its transition behavior toward improved reversibility. Our study reveals that Mn vacancies migrated into interlayer affect local environment Na+ water molecules consequently enhancing mobility. We observe better capacity retention for disordered "D-Na-birnessite", which undergoes reversible birnessite-type structure an O′3-type α-NaxMnO2-like another intermediate metastable phase. This research highlights positive effects regulate routes achieving superior reversibility, finally paving way overcoming limits oxide cathodes.

Language: Английский

Citations

0