Composite for anode active material and method of preparing the same

1. A method of preparing an anode slurry, the method comprising:

preparing a mixed solution by mixing a conductive agent for a composite, a polymer, and a core oxide in a solvent;

performing a heat treatment after spray drying the mixed solution to prepare the composite for an anode active material, and

mixing the anode active material, a conductive agent for an anode slurry, a binder and a natural graphite to prepare the anode slurry,

wherein the core oxide comprises any one oxide selected from the group consisting of metal oxide, semi metal oxide and a mixture thereof,

an amorphous carbon layer is coated on a surface of the core oxide, and

the amorphous carbon layer forms a matrix and the conductive agent for the composite is dispersed as a filler in the matrix.

2. The method of claim 1 , wherein the polymer comprises one or more selected from the group consisting of carboxymethyl cellulose (CMC), sucrose, polyacrylonitrile (PAN), and polyvinyl alcohol (PVA).

3. The method of claim 1 , wherein an amount of the conductive agent for the composite is in a range of 1 wt % to 20 wt % based on a total weight of the core oxide.

4. The method of claim 1 , wherein a viscosity of the solution comprising the conductive agent for the composite, the polymer, and the core oxide is 1,000 cps or less.

5. The method of claim 1 , wherein the spray drying is performed by injecting the mixed solution at a rate of 15 cc/min to 25 cc/min and an inlet temperature in a drying chamber of a spray dryer of 200° C. to 250° C.

6. The method of claim 1 , wherein the heat treatment is performed at a temperature ranging from 600° C. to 100° C.