LiNi0.5Mn1.5O4 cathode material by low-temperature solid-state method with excellent cycleability in lithium ion battery

LiNi0.5Mn1.5O4 cathode material was synthesized from a mixture of LiCl, NiCl2 6H(2)O and MnCl2 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 degrees C for 10 h. XRD patterns and FTIR spectroscopy showed that the LiNi0.5Mn1.5O4 cathode material exhibited an impurityfree spinel Fd3m structure. Electrochemical property results revealed that the LiNi0.5Mn1.5O4 cathode material charged at IC 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. (C) 2010 Elsevier B.V. All rights reserved.