Naslov
How to make lithium phosphate glasses better ionic conductors? – Effect of structural modification

Autori
Renka, Sanja ; Hostinský, Tomáš ; Kalenda, Petr ; Tricot, Grégory ; Mošner, Petr ; Koudelka, Ladislav ; Šantić, Ana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
6th Faculty of Science PhD Student Symposium, BOOK OF ABSTRACTS / - Zagreb, 2022, 94-95

Skup
6. Simpozij studenata doktorskih studija PMF-a = 6th Faculty of Science PhD Student Symposium

Mjesto i datum
Zagreb, Hrvatska, 23.04.2022. - 24.04.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Lithium phosphate glasses ; Ionic conductivtiy ; Glass structure
(Lithium Lithium phosphate glasses ; Ionic conductivtiy ; Glass structure)

Sažetak
Owning to the good thermal and electrochemical stability, lithium phosphate glasses are nowadays investigated as potential cathode and electrolyte materials in solid-state batteries. However, most of the glassy materials suffer from relatively low electrical conductivity which has been, in some cases, found to be greatly improved by the structural modification induced by the addition of second conventional or conditional glass-forming oxide. In this study, we report a huge enhancement of lithium ion conductivity arising with the replacement of P2O5 with MoO3 and WO3 in two glass series prepared by melt quenching technique: 40Li2O–xMoO3–(60-x)P2O5 and 40Li2O–xWO3–(60- x)P2O5 ; x=0-50 mol%. The electrical properties of these glasses were studied by the impedance spectroscopy (in a range of 0.01 Hz to 1 MHz and -90 °C to 240 °C) while the structural properties were evaluated by 31P MAS-NMR and Raman spectroscopies. As shown in Figure 1., the addition of WO3 and MoO3 significantly increases DC conductivity for five orders of magnitude in the case of tungsten and more than three in the case of molybdenum oxide. Also, the increase is continuous up to 40 mol% of WO3 and MoO3 while the conductivity remains nearly the same value for the highest content. The obtained electrical properties were found to be structurally driven in a way that incorporation of WO6 and MoO6 octahedra in phosphate glass network forms a more disordered and opened structural network which eases up the mobility of Li+ ions. However, at the 50 mol% structural network is dominated by three- dimensional clusters of WO6 and MoO6 octahedra which tends to limit the mobility of ions and hence their ionic conductivity.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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