High‐Entropy Layered Oxide Cathodes for Sodium‐Ion Batteries. (19th November 2019)

• Record Type: Journal Article
• Authors: Zhao, Chenglong; Ding, Feixiang; Lu, Yaxiang; Chen, Liquan; Hu, Yong‐Sheng
• Is Part Of: Angewandte Chemie. Volume 132:Number 1(2020)
• Page Start: 270
• Page End: 275
• Publication Date: 2019-11-19
• Subjects: Kathodenmaterialien -- Natrium-Ionen-Batterien -- O3-Struktur -- P3-Struktur -- Hochentropische Verbindungen; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201912171
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Material innovation on high‐performance Na‐ion cathodes and the corresponding understanding of structural chemistry still remain a challenge. Herein, we report a new concept of high‐entropy strategy to design layered oxide cathodes for Na‐ion batteries. An example of layered O3‐type NaNi0.12 Cu0.12 Mg0.12 Fe0.15 Co0.15 Mn0.1 Ti0.1 Sn0.1 Sb0.04 O2 has been demonstrated, which exhibits the longer cycling stability (ca. 83 % of capacity retention after 500 cycles) and the outstanding rate capability (ca. 80 % of capacity retention at the rate of 5.0 C). A highly reversible phase‐transition behavior between O3 and P3 structures occurs during the charge‐discharge process, and importantly, this behavior is delayed with more than 60 % of the total capacity being stored in O3‐type region. Possible mechanism can be attributed to the multiple transition‐metal components in this high‐entropy material which can accommodate the changes of local interactions during Na + (de)intercalation. This strategy opens new insights into the development of advanced cathode materials. Abstract : Ziemliche Unordnung : Eine Kathode aus einem hochentropischen Oxid (HEO) mit neun zusätzlichen Komponenten – die schichtförmige O3‐Phase NaNi0.12 Cu0.12 Mg0.12 Fe0.15 Co0.15 Mn0.1 Ti0.1 Sn0.1 Sb0.04 O2 – liefert hohe Zyklenstabilitäten und Lade‐/Entladeraten. Da >60 % der Kapazität in der O3‐Region gespeichert ist, ist die Entropiestabilisierung der O3‐Phase verantwortlich für die Zyklenstabilität und verbesserte Ratenleistung.