Abstract
LiNi 0.5 Mn 1.5 O 4 cathode material was synthesized from a mixture of LiCl, NiCl 2 6H 2 O and MnCl 2 4H 2 O with 70 wt.% oxalic acid by a low-temperature solid-state method. The calcination temperature was adjusted to form disorder Fd3m structure at 700-800 °C for 10 h. XRD patterns and FTIR spectroscopy showed that the LiNi 0.5 Mn 1.5 O 4 cathode material exhibited an impurity-free spinel Fd3m structure. Electrochemical property results revealed that the LiNi 0.5 Mn 1.5 O 4 cathode material charged at 1C rate to 4.9 V and discharged at 2 and 3 C to 3.5 V delivered initial capacity of 120 mAh/g and maintained a capacity retention over 80% at room temperature after 1000 charge/discharge cycles. © 2010 Elsevier B.V.