Patent ID: 9048493
Filing Date: 2015-06-02
Classification: C01G,C01P,H01M,Y02E

Abstract:
1. A cathode active material, comprising: a lithium composite oxide represented by Formula 1; and a lithium titanium oxide represented by Formula 2; wherein the lithium titanium oxide includes titanium having an average oxidation number of 4-w, where 0<w<2: wherein M is Mn, Zr, Ti, Mo, Zn, or a combination thereof; M′ is Ni, Co, Mn, Cr, Fe, V, A1, Mg, Ti, Mo, Cu, Zr, B, or a combination thereof; −0.5<x<1; 0<y<0.8; and 0≦z<1; and wherein Me is Al, Zr, Mg, Sn, Si, Ce, Zn, Mo, or a combination thereof; 3<a<8; 4<b+c<7; b≧c; 0≦c<1 and 11<d<13, wherein the cathode active material includes about 95 weight % to about 99.9 weight % of the lithium composite oxide, and about 0.1 to about 5 weight % of the lithium titanium oxide, wherein the lithium titanium oxide is heat-treated under a reduction atmosphere, wherein titanium nitride (TIN) or titanium oxynitride (TiON) is formed on the surface of the lithium titanium oxide and wherein the lithium titanium oxide includes titanium having a binding energy in a range of about 456.00 to 458.00 eV, as evaluated by an X-ray photoelectron spectroscopy analysis.