Electrical response of La2/3-xLi3xTiO3 ceramics obtained by spark plasma sintering

J Silva-Pereira,J Agostinho Moreira,Y Romaguera-Barcelay,R.S Silva,A Almeida,N.C Pillajo,J Anglada- Rivera,L Aguilera,F Guerrero,Y Leyet

doi:10.1051/epjconf/202023304003

Abstract

The ceramic system La2/3-xLi3xTiO3 presents as an interesting candidate to be used as an electrolyte in solid-state Li-ion batteries. In this paper the electrical response of the ceramic, La2/3-xLi3xTiO3 with x = 0.11 is reported. La2/3-xLi3xTiO3 nanoparticles were synthesized by high energy milling and sintered by Spark Plasma Sintering from an amorphous phase. After sintering, the samples were structurally characterized by XRD and Raman techniques. Measurements of complex impedance varying frequency from 1 Hz to 10 MHz and temperature from 25 °C to 270 °C were performed. The study of DC conductivity allowed us to find the contributions to the total conductivity, grain, and grain boundary of the samples. From the activation energy values, it was possible to determine the conductive mechanism corresponding to the mobility of Li+ ions.

Highlights

Lithium-based batteries are energy sources that need to be studied and developed, taking into consideration, in addition to their efficiency, public and environmental safety issues
The high conductivity values obtained from lanthanum lithium titanate with perovskite structure (LLTO) can be related to its open, stable and rigid crystalline structure, with holes and interstices accessible to the Li+ ion; the small mass and size of the lithium-ion facilitate the electric conduction process [7]
This behavior may be motivated by an increase in Li+ ion concentration in the crystalline structure of the material, which creates a larger number of point defects within the crystal structure of the LLTO

Summary

Introduction

Lithium-based batteries are energy sources that need to be studied and developed, taking into consideration, in addition to their efficiency, public and environmental safety issues In this respect, organic liquid electrolyte batteries with lithium-ion (Li+) carriers are flammable and susceptible to auto ignition, which may occur due to internal short circuit caused by physical damage after mechanical impact, heating at ambient temperatures, or internal manufacturing defect [1]. Organic liquid electrolyte batteries with lithium-ion (Li+) carriers are flammable and susceptible to auto ignition, which may occur due to internal short circuit caused by physical damage after mechanical impact, heating at ambient temperatures, or internal manufacturing defect [1] Incidents such as lithium-ion battery fires worry about the safety issue in personal electronics, transport vehicles, and commercial airplanes [2]. The high conductivity values obtained from LLTO can be related to its open, stable and rigid crystalline structure, with holes and interstices accessible to the Li+ ion; the small mass and size of the lithium-ion facilitate the electric conduction process [7]

Methods

Results

Conclusion