Synthesis and electrical conductivity of new lithium-ion conductive glasses.

• Grant number: 24/09802-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: July 01, 2024
• End date: June 30, 2025
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Ana Candida Martins Rodrigues
• Grantee: Janaina Manzali da Silva
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass, AP.CEPID

Abstract

Although glasses are generally considered dielectric or insulating materials, ionic conductivity in glasses has been known since the late 19th century. It is also known that the electrical conductivity of glasses is strongly dependent on their chemical composition, so slight variations in composition can result in significant changes in ionic conductivity. Ionic conduction in glasses is a consequence of the displacement of monovalent alkaline cations (or silver ions) and strongly depends on their concentration. However, a complete understanding of the mechanisms of ionic conduction in glasses is still an open field, although many models have already been proposed. The project in question aims to investigate ionic conduction in glasses; its main focus is to obtain new glass compositions, specifically in the lithium phosphate system, Li2O-P2O5, with the addition of aluminum halides, AlX3, X= F -, Cl-, Br-, I-, using sealed silica ampoules. This choice is motivated by the fact that lithium ions when introduced in the form of halides, increase ionic conductivity more than if the same amount of lithium were introduced in the form of Li2O. In this work, instead of using lithium halides, we will use aluminum halides, which configures new glass compositions in the literature. The glasses produced will be subjected to differential thermal analysis (DSC) and impedance spectroscopy for electrical characterization.