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Enhanced room-temperature Na+ ionic conductivity in Na$_{4.92}$Y$_{0.92}$Zr$_{0.08}$Si$_{4}$O$_{12}$

Yang, Aikai; Yao, Kai; Schaller, Mareen 1; Dashjav, Enkhtsetseg; Li, Hang 1; Zhao, Shuo; Zhao, Shuo; Zhang, Qiu; Etter, Martin; Shen, Xingchen; Song, Huimin; Lu, Qiongqiong; Ye, Ruijie; Moudrakovski, Igor; Pang, Quanquan; Indris, Sylvio ORCID iD icon 1; Wang, Xingchao ; Ma, Qianli ; Tietz, Frank; ... mehr

Abstract:

Developing cost-effective and reliable solid-state sodium batteries with superior performance is crucial for stationary energy storage. A key component in facilitating their application is a solid-state electrolyte with high conductivity and stability. Herein, we employed aliovalent cation substitution to enhance ionic conductivity while preserving the crystal structure. Optimized substitution of Y3+ with Zr4+ in Na5YSi4O12 introduced Na+ ​ion vacancies, resulting in high bulk and total conductivities of up to 6.5 and 3.3 ​mS ​cm−1, respectively, at room temperature with the composition Na4.92Y0.92Zr0.08Si4O12 (NYZS). NYZS shows exceptional electrochemical stability (up to 10 ​V vs. Na+/Na), favorable interfacial compatibility with Na, and an excellent critical current density of 2.4 ​mA ​cm−2. The enhanced conductivity of Na+ ​ions in NYZS was elucidated using solid-state nuclear magnetic resonance techniques and theoretical simulations, revealing two migration routes facilitated by the synergistic effect of increased Na+ ​ion vacancies and improved chemical environment due to Zr4+ substitution. NYZS extends the list of suitable solid-state electrolytes and enables the facile synthesis of stable, low-cost Na+ ion silicate electrolytes.


Verlagsausgabe §
DOI: 10.5445/IR/1000164615
Veröffentlicht am 21.11.2023
Originalveröffentlichung
DOI: 10.1016/j.esci.2023.100175
Scopus
Zitationen: 21
Dimensions
Zitationen: 20
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2023
Sprache Englisch
Identifikator ISSN: 2667-1417
KITopen-ID: 1000164615
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in eScience
Verlag Elsevier
Band 3
Heft 6
Seiten Art.-Nr.: 100175
Nachgewiesen in Scopus
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
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