Patent ID: 7781100

Claim:
A cathode material, comprising: a first compound having a formula of A 3x M1 2y (PO 4 ) 3 , said first compound including plural micrometer-sized secondary particles, each of which has a particle size larger than 1 μm and is composed of crystalline nanometer-sized primary particles, each of which has a particle size ranging from 10 to 500 nm; and a second compound being at least one compound selected from the group consisting of SiC, BN and metal oxide having a formula of M2 a O b and coating on said first compound, wherein A is at least one element selected from the group consisting of elements of Groups IA, IIA and IIIA; each of M1 and M2 is at least one element selected from the group consisting of elements of Groups IIA, IIIA, IVA and VA and transition metal elements, respectively; and 0<x≦1.2, 1.2≦y≦1.8, 0<a≦7, and 0<b≦6.