Synthesis and Electrochemical Properties of Ramsdellite Type Lithium Titanate Anode Materials by Spray Pyrolysis

Abstract

Ramsdellite type lithium titanate (Li₂Ti₃O₇) powders were prepared by spray pyrolysis. Chemical and physical properties of Li₂Ti₃O₇ powders were characterized by SEM, DTG, XRD and ICP. As-prepared Li₂Ti₃O₇ precursor powders had a spherical morphology with hollow microstructure, but the irregular shaped morphology was obtained after the calcination above 900 °C. The crystal phase of ramsdellite Li₂Ti₃O₇ was obtained by the calcination at 1100 °C. The first rechargeable capacities of Li₂Ti₃O₇ anode were 168 mAh/g and 82 mAh/g at 0.1 mA/cm² and 20 mA/cm², respectively. The retention ratio of discharge capacity was 99 % at 1 mA/cm² after 100th cycle. The cycle performance of Li₂Ti₃O₇ anode had also high stability at 50 °C.