3V SPINEL COMPLEX-OXIDE AS CATHODE MATERIAL OF LITHIUM SECONDARY BATTERIES, THE CARBONATE PRECIPITATION METHOD THEREOF, AND THE LITHIUM SECONDARY BATTERIES USING THE SAME

摘要

Disclosed herein is a 3V class spinel oxide with improved high-rate characteristics which has the composition Li1+x[MyMn(2−y)]O4−zSz (0≦̸x≦̸0.1, 0.01≦̸y≦̸0.5, 0.01≦̸z≦̸0.5, and M is Mn, Ni or Mg). Further disclosed is a method for preparing the 3V class spinel oxide by carbonate coprecipitation of starting materials, addition of sulfur, followed by calcining. The 3V class spinel oxide is spherical and has a uniform size distribution. A lithium secondary battery including the 3V class spinel oxide has a constant plateau at a potential of 3V and shows superior cycle characteristics.