Synthesis and electrochemical performances of Li4Ti4.95Al0.05O12/C as anode material for lithium-ion batteries

Spinel compounds Li4Ti5-xAlxO12/C (x=0, 0.05) were synthesized via solid state reaction in an Ar atmosphere, and the electrochemical properties were investigated by means of electronic conductivity, cyclic voltammetry, and charge-discharge tests at different discharge voltage ranges (0-2.5 V and 1-2.5 V). The results indicated that Al3+ doping of the compound did not affect the spinel structure but considerably improved the initial capacity and cycling performance, implying the spinel structure of Li4Ti5O12 was more stable when Ti4+ was substituted by Al3+, and Al3+ doping was beneficial to the reversible intercalation and deintercalation of Lit Al3+ doping improved the reversible capacity and cycling performance effectively especially when it was discharged to 0 V. (C) 2011 Elsevier Ltd. All rights reserved.