Synthesis and characterization of high-voltage cathode material LiNi_(0.5)Mn_(1.5)O_4 by one-step solid-state reaction

摘要

LiNi_(0.5)Mn_(1.5)O_4 was prepared under various conditions by one-step solid-state reaction in air and its properties were investigated by X-ray diffractormetry (XRD), scanning electron microscopy (SEM) and electrochemical measurement. XRD patterns show that LiNi_(0.5)Mn_(1.5)O_4 synthesized under various conditions has cubic spinel structure. SEM images exhibit that the particle size increases with increasing calcination temperature and time. Electrochemical test shows that the LiNi_(0.5)Mn_(1.5)O_4 calcined at 700℃ for 24 h delivers up to 143 mA · h/g, and the capacity retains 132 mA · h/g after 30 cycles.