ELECTRODE ASSEMBLY FOR SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING SAME

摘要

The present invention provides an electrode assembly for a secondary battery and a lithium secondary battery. According to the present invention, the electrode assembly comprises: an anode having an anode active material layer that is formed on an anode collector; a cathode having a cathode active material layer that is formed on a cathode collector; and an olefin-based separation film which is interposed between the anode and the cathode, wherein a positive temperature coefficient (PTC) material layer is formed on an upper surface of an active material layer of either the anode or the cathode. As a result, the PTC material layer allows active material to have a constant conductivity when a battery is operating normally, regardless of charging or discharging, and convert into a nonconductor when internal temperature of the battery climbs due to a short circuit or an accident.