Research on spray-dried lithium titanate as electrode materials for lithium ion batteries

Abstract

Li 4Ti 5O 12 has been considered as a promising electrode material for lithium secondary batteries. In this work a spray drying process was developed to prepare porous and spherical Li 4Ti 5O 12 powders with Li 2CO 3 and rutile type TiO 2 as precursors and PVB as forming agent of pores. The experimental results showed that porous and spherical morphology of the spray-dried powders was maintained during the sintering and the subsequent heat treatment. The oxygen atmosphere was demonstrated important to the electrochemical performance of the Li 4Ti 5O 12 powders. However, overtime heat treatment would result in superfluous loss of lithium content and therefore led to obvious decrease of charge and discharge capacities.