Abstract
With the aim to improve the ionic conductivity of perovskite materials used for all-solid-state batteries, La(2/3)−xLi3xTiO3 with x=0.11 (LLTO11) ceramics was prepared by a double mechanical alloying method. The influence of thermal treatments (furnace-cooling, SC and quenching, QC) on the crystalline structure and Li-ion conductive properties of the LLTO ceramics has been studied by X-ray powder diffraction (XRD), Raman scattering and impedance spectroscopy. XRD patterns of SC-samples exhibited a doubled perovskite with a tetragonal structure, whereas those of quenched samples indicated a simple cubic perovskite. The increase in the ionic conductivity of the LLTO11 ceramics was attributed to the disordered morphology that has promoted 3D-conductive mechanism. At room temperature, the grain and grain-boundary conductivities of the quenched LLTO11 ceramics reached values as large as 1.8×10−3S·cm−1 and 7.2×10−5S·cm−1, respectively. All-solid-state batteries made from the LLTO11 solid-state electrolyte combining with LiMn2O4, and SnO2 thin films as cathode and anode, respectively, possessed a charge-discharge efficiency of ~61% and a charging capacity of ~3.0μAh/(cm2·μm) at a voltage of 1.6V.
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