Thermal, structural and electrical properties of fluorine-doped Li3.6Al0.8Ti4.0P7.6O30-x/2Fx (x=0, 0.5, 1, 2) glass-ceramic electrolytes

The fluorine-doped Li3.6Al0.8Ti4.0P7.6O30-x/2Fx (x = 0, 0.5, 1, 2) glasses were prepared by the meltquenching method, to investigate the effect of different fluorine doping content on the electrochemical performance after crystallization. The FT-IR spectroscopy was used to investigate the characteristics of glass-forming structural units. DSC results show that Delta T (Tc-Tg) decreases from 83 degrees C to 58 degrees C with the increase of fluorine content, indicating an increase in the crystallization trend. XRD analysis confirmed the amorphous nature of the obtained glasses. Diffraction characteristic peaks of all annealed glass-ceramics match well with the crystalline phase LiTi2(PO4)(3) with rhombohedral NASICON-type structure. The Li3.6Al0.8Ti4.0P7.6O29.75F0.5 glass-ceramics obtained at 900 degrees C acquire the optimal conductivity at room temperature, which reaches a maximum value of 3.85 x 10(-5) S cm(-1). It is mainly attributed to that fluoride as a fluxing agent, is beneficial to the precipitation of the conductive crystalline phase, thereby promoting the precipitation of the conductive crystalline phases. (c) 2020 Elsevier B.V. All rights reserved.

Automated summary

Fluorine-doped Li3.6Al0.8Ti4.0P7.6O30-x/2Fx glasses prepared by the meltquenching method show that an increase in fluorine content leads to a decrease in Delta T (Tc-Tg). XRD analysis confirms the amorphous nature of the glasses, with diffraction characteristic peaks matching the LiTi2(PO4)3 crystalline phase. The glass-ceramics with 0.5 fluorine content exhibit the optimal conductivity at room temperature, reaching a maximum of 3.85 x 10(-5) S cm(-1).