Preparation and electrochemical performance of Ag doped Li4Ti5O12

Composite of Ag metal and Li4Ti5O12 was simply prepared by solid-state reaction with the addition of AgNO3 to the starting materials, TiO2 and Li2CO3. The electronic conductivity and electrochemical performance of Li4Ti5O12 were effectively improved by the dispersed Ag particles. DTA-TG, XRD, SEM, CV, AC impedance and charge-discharge cycle were used to evaluate the Ag-Li4Ti5O12 composite powders. Phase analysis showed that Ag did not enter the spinel structure. High rate discharge capacity and cycling ability of Li4Ti5O12 were particularly developed by Ag additives between the cut-off voltages of 2.3 and 0.5 V. (C) 2004 Elsevier B.V. All rights reserved.