3V CLASS SPINEL COMPLEX OXIDES AS CATHODE ACTIVE MATERIALS FOR LITHIUM SECONDARY BATTERIES, METHOD FOR PREPARING THE SAME BY CARBONATE COPRECIPITATION, AND 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 Li_1+x[M_yMn_(2−y)]O_4−zS_z (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.