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Details

Autor(en) / Beteiligte
Titel
Enhanced room-temperature Na+ ionic conductivity in Na4.92Y0.92Zr0.08Si4O12
Ist Teil von
  • eScience (Beijing), 2023-12, Vol.3 (6), p.100175, Article 100175
Ort / Verlag
KeAi Communications Co. Ltd
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • 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.
Sprache
Englisch
Identifikatoren
ISSN: 2667-1417
eISSN: 2667-1417
DOI: 10.1016/j.esci.2023.100175
Titel-ID: cdi_doaj_primary_oai_doaj_org_article_7329dec235604b47923f445df0451698

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