| abstract |
A composite for the cathode of Li-ion battery is disclosed and comprises: a base active material represented by Li 1+a (N 1-b-c Co b Mn c )O 2 wherein 0≤a≤0.5, 0≤b≤0.4, 0≤c≤0.6, with b+c<1; and a coating on the base active material comprising a phase containing the components B 2 O 3 or SnB x O 2+3x/2-y/2 F y ; wherein 0≤x≤5, 0<y<4+3x; wherein relative to the total amount of the base active material, the weight percentage of B element is not more than 2 wt %, the weight percentage of Sn element is not more than 5 wt %. A method for making a composite is disclosed and includes: mixing the base active material with the phase components and/or a precursor for the phase components; and firing the mixture obtained. The application provides a high capacity, long cycle life cathode material that is stabilized at high voltages. |