Publication detail

Ionic Conductivity of Lithium Germanium Phosphate Glass-Ceramics

Year: 2019

Type of publication: článek v odborném periodiku

Name of source: Journal of Physical Chemistry C

Publisher name: American Chemical Society

Place: Washington

Page from-to: 23312-23322

Titles:

Language	Name	Abstract	Keywords
cze	Iontová vodivost ve sklo-keramických materiálech germanáto-fosfátových s lithiem	Byl studován vliv krystalizace na přenos náboje ve směsných sklech o složení 40Li(2)O-(60 - x)P2O5-xGeO(2), x = 0-25 mol %, které mohou být potenciálními elektrolyty pro lithiové baterie. Zkoumán byl též vliv průběhu krystalizace na přenos elektrického náboje v připraveném sklo-keramickém materiálu. Struktura těchto materiálů byla studována s pomocí RTG, MAS NMR a SEM a korelována s elektrickými vlastnostmi studovanými impedanční spektroskopií. Krystalizace skle s vyšším obsahem GeO2 vede k růstu elektrické vodivosti.	vztahy struktura/vlastnosti; elektrické vlastnosti; krystalizace; NMR spektroskopie; RTG; SEM
eng	Ionic Conductivity of Lithium Germanium Phosphate Glass-Ceramics	In this study, the effect of induced crystallization on the electrical transport was studied in the mixed glass former glasses with the composition 40Li(2)O-(60 - x)P2O5-xGeO(2), x = 0-25 mol %, as potential solid electrolytes for Li-ion batteries. It has been of interest to investigate how various steps of crystallization influence electrical transport in prepared glass-ceramics. Structural properties of obtained glass-ceramics, which contain single to multicrystalline phases, are characterized by XRD, MAS NMR, and SEM and then correlated with electrical properties studied using impedance spectroscopy. For GeO2-free glass-ceramics, a slight increase in the electrical conductivity is evidenced, whereas a conductivity decrease for glass-ceramics containing up to 20 mol % GeO2 is related to the reduction of a number of lithium ions in the residual glassy phase, since the LiPO3 crystalline phase is formed. The crystallization in the glass-ceramics with higher GeO2 content causes an increase in the electrical conductivity. This increase is a result of two simultaneous contributions. One is the formation of crystallites with well-defined shapes, which creates easy conduction pathways for lithium ion transport within crystalline grains and along crystalline grain boundaries. And the second one is the increase of the predominantly phosphate amorphous phase for samples Ge-25.	structure/property correlations; electrical-properties; crystallization; NMR spectroscopy; XRD; SEM

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