Abstract
LiM x Mn 2− x O 4 (M=Co, Ni) materials have been synthesized by a melt-impregnation method using γ-MnOOH as the manganese source. Highly crystallized LiM x Mn 2− x O 4 compounds were synthesized at a calcination temperature of 800°C for 24 h in air. All compounds show a single phase except for LiNi 0.5Mn 1.5O 4 based on the X-ray diffraction (XRD) diagram. With the increase of the doping content from 0.1 to 0.5, the capacity of doping materials decreases mainly in the 4 V region. Although LiM 0.5Mn 1.5O 4 (M=Co, Ni) compound shows a small capacity in the (3+4) V region compared with parent LiMn 2O 4, it is a very effective material in reducing capacity loss in the 3 V region that is caused by the Jahn–Teller distortion. The doping of Co and Ni ions in the LiMn 2O 4 cathode material promotes the stability of this structure and provides an excellent cyclability.
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