High capacity electrode active material for lithium secondary battery and lithium secondary battery using the same

A lithium secondary battery, comprising:

• an electrode having an electrode active material;
• and
• an electrolyte solution, wherein the electrode active material comprises:
• a microstructure of a first material, the first material including a carbon material;
• a nanostructure of a second material directly contacting the surface of the microstructure, wherein the nanostructure partially covers the surface of the microstructure and wherein the second material includes at least one selected from a metal and a metalloid capable of reversibly alloying with lithium;
• and
• a coating of a third material present on surfaces of both of the microstructure and the nanostructure to control a side reaction with an electrolyte solution, wherein the coating partially covers the surface of the microstructure such that a portion of the surface of the microstructure is exposed to the electrolyte solution,
• wherein the third material includes any one selected from the group consisting of oxides or nitrides of Si, Sn, Al, Sb, Bi, As, Ge, and Pb, and
• wherein the second material and the third material are different materials.