Síntesis sol-gel de titanato de litio a diferentes temperaturas y su influencia en el almacenamiento de ion-litio

SUSANA CHAUQUE; FABIANA Y. OLIVA; DANIEL BARRACO; EZEQUIEL P.M LEIVA; OSVALDO R. CÁMARA

Congreso; Congreso Internacional de Metalurgia y Materiales 16º SAM-CONAMET; 2016

batteries (LIBs) commercialized by Sony since 1991, the anodic material was graphite and the cathodic material was layer oxide. LIBs have the advantage of lower weight, higher energy density and faster charge and discharge rates. Lithium titanate Li4Ti5O12 (LTO) is currently one of the best candidates for anode materials of safer LIBs since the lithium insertion process takes place at a higher potential than graphite, thereby minimizing the decomposition of the solvent employed and consequently avoiding the formation of a solid electrolyte interface. It also has a small volume change when Li+ ions are intercalated and a prolonged lifetime in charge/discharge cycling [1]. In this work, we use a different method than the solid-state reactionmethod used previously [2] in order to obtained a material with an adequate control of properties as particle size and crystallinity. A Sol-gel synthesis at different final temperatures was performed to analyze the effect in crystallinity and particle size and its relationship between both parameters with the specific capacity to storage Li+ in the host matrix of the different material obtained. The materials were characterized structural and morphologically using XRD and SEM techniques. To study the effect of the thermal treatment on materials storage capacity, galvanostatic cycling, cyclic voltammetry and rate capability experiment were performed.The results indicates that there is an optimal thermal treatment below which the obtained material has no phase neither crystallinity required for the lithium ion insertion, and above which particles agglomeration were produced reducing the exposed area to electrolyte. Both effects reduce the specific capacity cyclability and rate capability performance of the substrate used as anode material.1. C. P. Sandhya, B. John, and C. Gouri, Ionics (Kiel), 20, 601 (2014).2. Susana Chauque, Carla B. Robledo, Ezequiel P. M. Leiva, Fabiana Y. Oliva and Osvaldo R. Cámara. ECS Transactions, 63 (1) 113-128 (2014)