Secondary particle and lithium battery comprising the same

PURPOSE: Secondary particles and a lithium battery comprising the same are provided to ensure excellent capability and cycle lifetime characteristics at the same time since the secondary particles has excellent conductivity. CONSTITUTION: Secondary particles have a structure where n polycyclic nano-sheets are laminated along the direction vertical to one plane thereof. In the polycyclic nano-sheet, rings in which 6 carbon atoms are connected in a hexagon shape are condensed with one another and arranged on one plane, wherein n is the integer of 2-100.