Conductive material for lithium secondary battery and electrode for lithium secondary battery including the same

1. A method of manufacturing a secondary battery containing a pitch coated graphene sheet as a conductive material in an anode of the secondary battery, the method comprising:

forming a pure graphene sheet;

mixing the graphene sheet and the coal-based pitch to form a mixture consisting of the graphene sheet and the coal-based pitch;

baking the mixture at a high temperature to manufacture the pitch coated graphene sheet, wherein the baking at the high temperature is conducted by maintaining at 250° C. for 3 hours under an air atmosphere, increasing the temperature at a rate of 2° C./min to 1,150° C. under a nitrogen atmosphere, and baking at 1,150° C. for 5 hours for carbonization to form the pitch coated graphene sheet; and

making an anode slurry comprising an anode active material, a binder and a conductive material wherein the conductive material consists of the pitch coated graphene sheet,

wherein the pitch coated graphene sheet is included in an amount of 1 to 15 wt % based on a total amount of the anode active material in the anode slurry,

wherein the pitch is included in an amount of 6 to 15 wt % based on a total amount of the conductive material for the secondary battery.

2. The method of claim 1 , wherein the pure graphene sheet is a graphene sheet of a single layer separated from graphite through a chemical exfoliating process.

3. The method of claim 2 , wherein the forming of the graphene sheet comprises heat treating the separated graphene sheet under an Ar/H 2 mixture gas atmosphere to remove oxygen in the graphene sheet.

4. The method of claim 1 , wherein the amount of pitch included is 6 to 10 wt % based on the total amount of the conductive material for the secondary battery.