Patent ID: 8609284

Claim:
A composite for the cathode of Li-ion battery comprising: a base active material represented by Li 1+y (Ni a —Co b —Mn c —Y d )O 2 wherein Y is at least one selected from Mg, Zn, Al, Ga, Cu, B, Zr, and Ti, y is 0 to 0.5, a is 0.1 to 0.6, b is 0.05 to 0.5, c is 0.25 to 0.8, d is 0 to 0.02, and the sum of a, b, c and d is 1; and a coating on the base active material comprised of a glassy phase containing the components Li 2 O, B 2 O 3 and LiX in which LiX is at least one of Li 2 F 2 , Li 2 Cl 2 and Li 2 SO 4 , relative to the total amount of the glassy phase, the mole percent of Li 2 O is 43% to 75%, the mole percent of B 2 O 3 is 25% to 57%, the mole percent of LiX is from more than 0% to 20%, and the sum of the mole percents of Li 2 O, B 2 O 3 and LiX is 100%.