Synthesis and Characterization of a New Spinel, Li[sub 1.02]Al[sub 0.25]Mn[sub 1.75]O[sub 3.97]S[sub 0.03], Operating at Potentials Between 4.3 and 2.4 V

A new spinel material, oxysulfide , has been synthesized using a sol‐gel method. The cathode fabricated using the material shows the capacities of 89.5, 125, and 196 mAh/g in the 4 V (4.3 to 3.0 V), 3 V (2.4 to 3.5 V) and both the 3 and 4 V regions (4.3 to 2.4 V), respectively. This material exhibits no capacity loss after 30 cycles in both the 3 and 4 V regions during cycling. It was found that S doping was very effective in suppressing the formation of the tetragonal phase of in potential ranges of 2.4 to 4.3 V. © 2000 The Electrochemical Society. All rights reserved.