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).