Preparation and Electrochemical Performance of Spinel-Type Compounds Li[sub 4]Al[sub y]Ti[sub 5−y]O[sub 12] (y=0, 0.10, 0.15, 0.25)

and doped 0.15, 0.25) were synthesized via solid-state reaction using -rutile, and as starting reagents. The charge-discharge cycling of the cells showed that the electrochemical performance of prepared from rutile-type by our laboratory was as good as that produced by anatase-type However, doped exhibited a much better electrochemical performance in comparison with undoped Among the three samples of exhibited the largest reversible capacity and the highest coulombic efficiency. The discharge capacity values in the first and second cyclings were 195.6 and 173.6 mAh/g, respectively. The value remained 166.9 mAh/g after 30 cycles with a capacity loss of 3.86% compared to the second cycle, and the coulombic efficiency was 99.2% at the 30th cycle. © 2004 The Electrochemical Society. All rights reserved.