Your browser doesn't support javascript.
loading
Exploring the Effect of V2O5 and Nb2O5 Content on the Structural, Thermal, and Electrical Characteristics of Sodium Phosphate Glasses and Glass-Ceramics.
Marijan, Sara; Klaser, Teodoro; Mirosavljevic, Marija; Mosner, Petr; Koudelka, Ladislav; Skoko, Zeljko; Pisk, Jana; Pavic, Luka.
Afiliación
  • Marijan S; Division of Materials Chemistry, Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia.
  • Klaser T; Division of Materials Chemistry, Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia.
  • Mirosavljevic M; Division of Materials Chemistry, Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia.
  • Mosner P; Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice, Czech Republic.
  • Koudelka L; Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice, Czech Republic.
  • Skoko Z; Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, 10000 Zagreb, Croatia.
  • Pisk J; Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
  • Pavic L; Division of Materials Chemistry, Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia.
Int J Mol Sci ; 25(5)2024 Mar 05.
Article en En | MEDLINE | ID: mdl-38474252
ABSTRACT
Na-V-P-Nb-based materials have gained substantial recognition as cathode materials in high-rate sodium-ion batteries due to their unique properties and compositions, comprising both alkali and transition metal ions, which allow them to exhibit a mixed ionic-polaronic conduction mechanism. In this study, the impact of introducing two transition metal oxides, V2O5 and Nb2O5, on the thermal, (micro)structural, and electrical properties of the 35Na2O-25V2O5-(40 - x)P2O5 - xNb2O5 system is examined. The starting glass shows the highest values of DC conductivity, σDC, reaching 1.45 × 10-8 Ω-1 cm-1 at 303 K, along with a glass transition temperature, Tg, of 371 °C. The incorporation of Nb2O5 influences both σDC and Tg, resulting in non-linear trends, with the lowest values observed for the glass with x = 20 mol%. Electron paramagnetic resonance measurements and vibrational spectroscopy results suggest that the observed non-monotonic trend in σDC arises from a diminishing contribution of polaronic conductivity due to the decrease in the relative number of V4+ ions and the introduction of Nb2O5, which disrupts the predominantly mixed vanadate-phosphate network within the starting glasses, consequently impeding polaronic transport. The mechanism of electrical transport is investigated using the model-free Summerfield scaling procedure, revealing the presence of mixed ionic-polaronic conductivity in glasses where x < 10 mol%, whereas for x ≥ 10 mol%, the ionic conductivity mechanism becomes prominent. To assess the impact of the V2O5 content on the electrical transport mechanism, a comparative analysis of two analogue series with varying V2O5 content (10 and 25 mol%) is conducted to evaluate the extent of its polaronic contribution.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fosfatos / Niobio Idioma: En Revista: Int J Mol Sci Año: 2024 Tipo del documento: Article País de afiliación: Croacia Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fosfatos / Niobio Idioma: En Revista: Int J Mol Sci Año: 2024 Tipo del documento: Article País de afiliación: Croacia Pais de publicación: Suiza