Synthesis and Electrochemical Properties of Lithium Titanate Anode Materials Powders by Solid State Reaction of Li and Spherical TiO2 Powders

摘要

Li4Ti5O12 powders were synthesized by solid state reaction of Li2CO3 and sphericalcomposite powders of carbon and TiO2 (denoted as C/TiO2). C/TiO2 powders were synthesized byspray pyrolysis of using lactic acid aqueous solution. The particle characteristics of Li4Ti5O12powders were determined by SEM, XRD and DTA-TG. DTA-TG showed that the carbon contentwas around 8 wt% in Li4Ti5O12 powders. XRD revealed that the spinel structure (Fd3m) was obtainedby heating at 750 °C under N2 atmosphere. The first rechargeable capacity of Li4Ti5O12 anode wasabout 160 mAh/g at 1 C. That of Li4Ti5O12 anode decreased to 90 mAh/g at 20 C. The rechargeablecapacity of Li4Ti5O12 anode decreased with increasing the rechargeable rate, but 81% of initialdischarge capacity of Li4Ti5O12 anode was retained after 200 cycles at 1C.