Abstract
Solid electrolytes are widely used in electrochemical devices. Among these materials, electrolytes with the lithium-ion conductivity can be used in high-energy lithium and lithium-ion power sources. The perspective Li6.75La3Zr1.75Nb0.25O12 solid electrolyte was synthesized by modified sol-gel synthesis method using the sparingly soluble Nb2O5 as one of the initial compounds. The influence of pressure and final sintering temperature on phase composition, density and lithium-ion conductivity was studied. Solid electrolyte obtained at 1150°C was single phase and had a cubic structure with the space group Ia-3d. Thus in the presented work, the cubic modification of Li6.75La3Zr1.75Nb0.25O12 was obtained by thermal treatment for 1 h at 1150°C (versus 36 h at 1200°C in the literature). Moreover at this temperature the samples had the highest density and total lithium-ion conductivity (3.9·10–5 Scm–1 at 25°C). According to the SEM study ceramic samples have a dense structure with a particle size ∼1-3 μm. Solid electrolyte was also obtained by isostatic pressing at a pressure of 500 MPa but the values of density and total lithium-ion conductivity were comparable with that of the samples compressed statically.
Highlights
Energy has an important role in many aspects of human life
According to the X-ray diffraction method (XRD) analysis, the pattern reflections of the obtained electrolytes after their annealing at different temperatures corresponded to the cubic modification of Li7La3Zr2O12 with the space group Ia-3d [6]
In this work the modified sol-gel synthesis method of solid electrolytes based on Li7La3Zr2O12 using the sparingly soluble niobium oxide as one of the initial compounds was developed
Summary
Energy has an important role in many aspects of human life. The increase in population and the aspiration for higher living standards leads to the growth in the necessity of high-energy power sources. The main advantages of the Li7La3Zr2O12 are the electrochemical stability versus metallic lithium and high lithium-ion conductivity of the cubic modification at room temperature (~10–4 S cm–1) [6]. The synthesis of electrolytes based on Li7La3Zr2O12 with the perspective addition of Nb is carried out using a solid-phase method with an exposure at high temperatures for a long time (for example, at 1200°C for 36 h [8]).
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