PREPARATION, ELECTROCHEMISTRY PROPERTIES OF LiNi0.5-xFe0.0485Mn1.5-yO4 BY SPRAY-DRY METHOD WITH DIFFERENT Mn/Ni RATIOS

LiNi0.5Mn1.5O4 is considered to be one of the most promising cathode material for next generation high-energy density secondary lithium batteries because of its high theoretical specific capacity of 146.7 mA h g(-1) and high theoretical specific energy of 650 W h kg(-1). In this work, LiNi0.5-xFe0.0485Mn1.5-yO4 with different Mn/Ni ratios were prepared via spray-dry process by controlling reaction conditions. The results show that LiNi0.5-xFe0.0485Mn1.5-yO4 has good crystallinity, good conductivity and less impurities with excellent electrochemical properties. The electrochemical tests show that the LiNi0.485Fe0.0485Mn1.475O4 sample delivers a high initial discharge capacity of 128 mA h g(-1) and a good cycling stability (reversible discharging capacity of 124 mA h g(-1) with a capacity retention of 95% in 200 cycles and approximately 124 mA h g(-1) in 300 cycles operated at 1 C rate).