Crystalline phase content and ionic conductivity correlation in LATP glass–ceramic

Abstract

Li 2 O-Al 2 O 3 -TiO 2 -P 2 O 5 (LATP) glass was fabricated by conventional melt quenching route. Glass transition temperature (T g =296°C) and crystallization temperatures (T C1,2 ) were obtained from thermal analysis. LATP glass was converted to glass-ceramic by heat treatment in the range 550-950°C for 6 h. X-ray diffraction analysis revealed LiTi 2 (PO 4 ) 3 as a major phase. Ionic conductivity increased monotonically with concentration, reaching a maximum of~10 −4 S/cm. AlPO 4 phase was detected in samples heat-treated above 850°C. Its presence decreased the conductivity, suggesting LiTi 2 (PO 4 ) 3 phase as main contributor to high ionic conductivity. NMR spectra confirmed the presence of mobile 7 Li ions in the entire sample series and also gave some information on the structure and dynamics of conductivity.

Effect of temperature of Li2O–Al2O3–TiO2–P2O5 solid-state electrolyte coating process on the performance of LiNi0.5Mn1.5O4 cathode materials

“…The intensity of these peaks increases with the heat treatment temperature, implying that crystallinity of phase goes up with the increase of temperature. Kulkarni et al [30] prepared LATP glass-ceramic and studied crystalline phase content of LATP calcined at different temperatures, their XRD results is similar to ours.…”

Dense on Porous Solid LATP Electrolyte System: Preparation and Conductivity Measurement

“…Lithium aluminum titanium phosphates (LATP) are one of the best candidates due to their conductivity as high as 3 × 10 −4 S/cm for the optimized composition Li 1+ x Al x Ti 2‐ x (PO 4 ) 3 x = 0.3. A large number of preparation methods are reported for LATP powders in the literature, from solid‐state reactions that could be followed by a mechanical activation, to sol–gel possibly associated with a 3D shaping, co‐precipitation, or hydrothermal reaction . In all cases, extra treatments are then applied for shaping and sintering.…”

Microwave Processing for Improved Ionic Conductivity in Li2O–Al2O3–TiO2–P2O5 Glass‐Ceramics

“…These values are slightly lower than values, found by Soman et al. for glass‐ceramics crystallized under 850°C, and significantly lower than the 0.76 eV activation energy found for samples heated about 850°C in that work . This improvement is promising, especially for the microwave‐heated samples, because this demonstrates that both higher conductivity and low activation energy can be achieved.…”