An Ordered Ni6 -Ring Superstructure Enables a Highly Stable Sodium Oxide Cathode

An Ordered Ni6 -Ring Superstructure Enables a Highly Stable Sodium Oxide Cathode

© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 31(2019), 43 vom: 04. Okt., Seite e1903483
1. Verfasser: Wang, Peng-Fei (VerfasserIn)
Weitere Verfasser: Weng, Mouyi, Xiao, Yao, Hu, Zongxiang, Li, Qinghao, Li, Meng, Wang, Yi-Ding, Chen, Xin, Yang, Xinan, Wen, Yuren, Yin, Ya-Xia, Yu, Xiqian, Xiao, Yinguo, Zheng, Jiaxin, Wan, Li-Jun, Pan, Feng, Guo, Yu-Guo
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2019
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article Ni6-ring cathode electrochemistry sodium-ion batteries superstructure
Beschreibung
Zusammenfassung:© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Sodium-based layered oxides are among the leading cathode candidates for sodium-ion batteries, toward potential grid energy storage, having large specific capacity, good ionic conductivity, and feasible synthesis. Despite their excellent prospects, the performance of layered intercalation materials is affected by both a phase transition induced by the gliding of the transition metal slabs and air-exposure degradation within the Na layers. Here, this problem is significantly mitigated by selecting two ions with very different MO bond energies to construct a highly ordered Ni6 -ring superstructure within the transition metal layers in a model compound (NaNi2/3 Sb1/3 O2 ). By virtue of substitution of 1/3 nickel with antimony in NaNiO2 , the existence of these ordered Ni6 -rings with super-exchange interaction to form a symmetric atomic configuration and degenerate electronic orbital in layered oxides can not only largely enhance their air stability and thermal stability, but also increase the redox potential and simplify the phase-transition process during battery cycling. The findings reveal that the ordered Ni6 -ring superstructure is beneficial for constructing highly stable layered cathodes and calls for new paradigms for better design of layered materials
Beschreibung:Date Completed 25.10.2019
Date Revised 01.10.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.201903483