Solid electrolytes based on TEOS hybrid matrix for Lithium-ion batteries

PROCACCINI, R. A.; PELLICE, S. A.; DESIMONE, P. M.

Mar del Plata

Congreso; 34th Topical Meeting of the International Society of Electrochemistry; 2023

International Society of Electrochemistry

The work plan is based on the synthesis and evaluation of solid electrolytes for secondary lithium batteries, using non-toxic and environmentally safe precursors. At the same time, testing of the solid electrolytes on the active cathode C/LiFePO4 will be an important part of the study. The technological development of this material presents some challenges related to the use of low-cost and ecological materials for the active components of the battery. Regarding the solid electrolytes for lithium-ion batteries (LIBs), the main objective is to develop a non-aqueous material with high conductivity in Li+ ion (σLi > 10-3 S cm-1) over the range of working temperatures and thermodynamic stability window within the working voltage range. The sol-gel synthesis route was used to obtain electrolyte films with different compositions based on a mixture of alkylalkoxides in the ethanolic phase. This method has proven to be versatile, and constitutes a viable methodology for the development of functionalized hybrid materials Electrochemical and spectroscopic characterization techniques was used, such as electrochemical impedance, charge-discharge curves, FTIR, SEM, TEM, Raman, and thermal analysis (TGA-DTA). The experimental development was carried out for the preparation and characterization of hybrid electrolytes based on the alkoxide precursor tetraethoxysilane (TEOS) and the organically modified alkoxide propyltrimethoxysilane (PTMS). The incorporation of lithium ions during synthesis was acquired using different lithium ion precursors, such as acetate (LiOOCCH3) and carbonate (Li2CO3). By using FTIR and Raman spectroscopies the hybrid structure formation as well as the interactions between Li ions and hybrid network was confirmed. Also, electrochemical techniques showed both ionic conductivities above 10-5 S cm-1 at room temperatures, and stability of solid electrolyte to cycling on C/LiFePO4 cathodic material.