Patent ID: 7824807

Claim:
A positive electrode material for a lithium secondary battery, comprising: a plurality of primary particles comprising lithium complex oxides, wherein an average particle diameter of the primary particles is 0.1 to 3.0 μm; and a plurality of ultrathin carbon fibers dispersed uniformly among the plurality of primary particles so that the primary particles are linked to one another to form a secondary particle wherein the ultrathin carbon fibers have a diameter of 10 to 50 nm, wherein the length of the ultrathin carbon fibers is from 2 to 8 μm, and the ultrathin carbon fibers are contained in the positive electrode material in an amount of 6 to 10% by weight; wherein the ultrathin carbon fibers have opposite ends from which an electrolytic solution can move in and out, and have lengths equal to or smaller than a diameter of the secondary particle.