3V-class spinel composite oxide as positive electrode active material for lithium secondary battery, its production method by carbonate coprecipitation method, and lithium secondary battery 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(2y)]O4zSz (0x0.1, 0.01y0.5, 0.01z0.5, 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.