Lithium ion-conducting glass-ceramics in the system Li2O–TiO2–P2O5–Cr2O3–SiO2

• Dopant free ionic conductive Li2O–TiO2–P2O5 glass-ceramics were fabricated.
• The effect of Cr dopant on the microstructure of the LTP glass-ceramic was studied.
• The composition dependency of ionic conductivity was explored.

Conductive glass-ceramics based on Li2O–TiO2–P2O5–Cr2O3–SiO2 system were fabricated by heat-treatment at the crystallization peak temperature for 2 h. The crystallization behavior of glass-ceramics was identified by differential thermal analysis (DTA), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) methods and their conductivity behavior was investigated by complex impedance techniques. The glass-ceramics were mainly composed of LiTi2(PO4)3 in which Ti4 + ions were partially replaced by Cr3 + ions. A considerable enhancement in conductivity was observed by partial substitution of Ti4 + by Cr3 + ions. 100 part [Li1.5Cr0.5Ti1.5(PO4)3] and 5 part SiO2 glass-ceramics in the 100 part [Li1 + xCrxTi2 − x(PO4)3] and 5 part SiO2 system, where x = 0–0.8, exhibited the highest ambient conductivity value of 2.14 × 10− 2 S/cm with an activation energy as low as 15.1 kJ/mol.