Electrochemical characteristics of LiNi0.5Mn1.5O4 cathodes with Ti or Al current collectors

LiNi0.5Mn1.5O4 was prepared and tested as a cathode material with 5 V operation cell voltage. When using Ti mesh current collector, this cathode material did not exhibit good performance, due to the corrosion of Ti mesh current collector. On the other hand, LiNi0.5Mn1.5O4 material showed the excellent rechargeability and relatively high discharge capacity when using an Al current collector. A coin-type cell was also constructed to test the practical stability of this cathode material. The discharge capacity was 120 mAh g(-1) and the rechargeability was 100% during 30 cycles. The average discharge potential was 4.8 V vs. Li/Li+. This electrochemical behavior was much better than LiMn2O4 and LiCoO2. Moreover, the 100% cycleability of this material indicates that the electrolyte decomposition does not take place on this cathode material. (C) 2002 The Electrochemical Society.