Preparation and characterization of LiMn2-xMgxO4 by Low-temperature Flameless Solution Combustion Synthesis

摘要

The spinel Mg-doped LiMn2-xMgxO4 (0≤x≤0.10) lithium ion cathode material was prepared by LiNO3,Mn(Ac)2.4H2O and Mg(Ac)2.4H2O by a low-temperature flameless solution combustion at 400°C,and HNO3 was used as oxidant.The results showed that the crystallinity of prepared material was superior to the pure LiMn2O4,and this method was better than traditional solid-state method.The particle sizes of the Mg-doped spinel LiMn2-xMgxO4 decreased with the increase of Mg doping,and the particle sizes were 50 to 90 nm; the crystal lattice interface was clear.The original capacities of Mg-doped were lower than that of undoped LiMn2O4(109.2 mAh/g) excepts for x(Mg)=0.04,original capacity of which was 128mAh/g.However,the rentions of all the doped spinels were higher than that of undoped spinel.