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
AssigneeIucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
InventorYang Kook Sun
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Abstract
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.
Claims14
A 3V class spinel oxide having the composition Li1+x[MyMn(2−y)]O4 (0≦x≦0.1, 0.01≦y≦0.5, and M is Mn, Ni or Mg) as a cathode active material for a lithium secondary battery.
A method for preparing a 3V class spinel oxide by feeding distilled water purged with carbonic acid gas, an aqueous solution containing at least one transition metal except Mn as a central metal, an aqueous ammonia solution and a carbonate solution into a reactor to prepare a transition metal complex carbonate by carbonate coprecipitation, primarily calcining the transition metal complex carbonate to prepare a transition metal complex oxide, and adding an excess of a lithium salt with respect to the stoichiometric ratio of the transition metal complex oxide, followed by secondary calcining, to prepare 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).
Dependencies are inferred from the claim text.