Preparation and characterization of LiMn_(1.5)Me_(0.5)O_4 (Me = Ti, Fe, Ni, Zn) for lithium-ion battery cathode materials

摘要

Based on synthesizing pure spinel type lithium manganese oxides, the derivations such as LiMn_(1.5)Ti_(0.5)-O_4, LiMn_(1.5)Fe_(0.5)O_4 , LiMn_(1.5)Ni_(0.5)O_4 and LiMn_(1.5)Zn_(0.5)O_4 were prepared using solid-step-sintering method. The structures were characterized by using XRD, SEM and laser granulometer. The electrochemical measurement results show that the element of iron or nickel can raise the discharging plateau voltage of LiMn_2O_4, and element titanium improves the electrochemistry property of LiMn_2O_4 little, while element zinc destroys the electrochemistry property of LiMn_2O_4. The influence of elements of titanium, iron, nickel, or zinc on the structure of LiMn_2O_4 pure phase was discussed from the viewpoint of structural chemistry.