Regulation of Coordination Chemistry for Ultrastable Layered Oxide Cathode Materials of Sodium-Ion Batteries

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 16 vom: 17. Apr., Seite e2311523
1. Verfasser:	Gao, Suning (VerfasserIn)
Weitere Verfasser:	Zhu, Zhuo, Fang, Hengyi, Feng, Kun, Zhong, Jun, Hou, Machuan, Guo, Yihe, Li, Fei, Zhang, Wei, Ma, Zifeng, Li, Fujun
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2024
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article capacity retention cation migration coordination chemistry layered oxide cathode sodium‐ion battery

Beschreibung
Zusammenfassung:	© 2024 Wiley‐VCH GmbH. Layered transition-metal (TM) oxide cathodes have attracted growing attention in sodium-ion batteries (SIBs). However, their practical implementation is plagued by Jahn-Teller distortion and irreversible cation migration, leading to severe voltage decay and structure instability. Herein, O3-Na0.898K0.058Ni0.396Fe0.098Mn0.396Ti0.092O2 (KT-NFM) is reported as an ultrastable cathode material via multisite substitution with rigid KO6 pillars and flexible TiO6 octahedra. The K pillars induce contracted TMO2 slabs and their strong Coulombic repulsion to inhibit Ni/Fe migration; and Ti incorporation reinforces the hybridization of Ni(3deg*)-O(2p) to mitigate the undesired O3-O'3 phase transition. These enable the reversible redox of Ni2+↔Ni3 . 20+ and Fe3+↔Fe3.69+ for 138.6 mAh g-1 and ultrastable cycles with >90% capacity retention after 2000 cycles in a pouch cell of KT-NFM\|\|hard carbon. This will provide insights into the design of ultrastable layered cathode materials of sodium-ion batteries and beyond
Beschreibung:	Date Revised 18.04.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202311523