Abstract
Lithium-ionic conductors of Li1+xAlxGe2-x(PO4)3 family are considered as one of the most attractive solid electrolytes. Li1.5Al0.5Ge1.5(PO4)3 composition obtained by glass-ceramic route exhibits the highest electrical conductivity at room temperature. The introduction of sintering additives makes it possible to modify the properties of solid electrolytes. Glass-ceramics of the Li1.5Al0.5Ge1.5(PO4)3–xB2O3 series (x = 0, 0.05, 0.1, 0.15, 0.2 wt%) was obtained by glass crystallization at optimal conditions of heat treatment. The influence of B2O3 additive on thermal stability and crystallization process of initial glasses was studied by DSC method. The phase composition, microstructure and transport properties of glass-ceramics were investigated by XRD, SEM and impedance spectroscopy, respectively. The structure of the glass-ceramics was characterized by Raman spectroscopy. Glass-ceramics was found to be single-phase (R-3c) when 0 ≤ x ≤ 0.15, but impurity phases Li4P2O7 and AlPO4 appear at x = 0.20. The conductivity of B2O3-added solid electrolytes is higher compared to the pristine Li1.5Al0.5Ge1.5(PO4)3. Its ionic conductivity reached 5.5 × 10−4 S cm−1 at 25 °C. The obtained glass-ceramic electrolytes are promising for use in all-solid-state lithium-ion batteries.
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