Preparation and Characterization of superionic conductive Li_2O-Al_2O_3-La_2O_3-TiO_2-P_2O_5 glass-ceramics

摘要

Li_2O-Al_2O_3-La_2O_3-TiO_2-P_2O_5 glass-ceramics were fabricated through heat-treatment of the original glass. The differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical workstation were employed to study the structural, morphology and electrical properties of the samples heat-treated at different temperatures. The results showed that: the glass-ceramics consist of the dominating LiTi_2(PO_4)_3 phases, trifle AlPO_4, TiO_2 and unknown phases. With the heat-treatment temperature increasing from 700 °C to 1100 °C, the structure of glass-ceramic become denser and grain grew, lithium ion conductivity increased quickly and subsequent cut down gradually. While the specimen was obtained by crystallization at 900 C for 12 h, the total conductivity of glass-ceramic material come up to the maximum (5.85 × 10~(-4) S-cm~(-1)) at 25 °C. This inorganic solid electrolyte has a potential application in lithium batteries or other devices.