MICROCAPSULE WITH FIRE EXTINGUISHING COMPOSITION BUILT THEREIN, AND LITHIUM SECONDARY BATTERY HAVING SAME

摘要

The present invention relates to a microcapsule with a fire extinguishing composition built therein, and a lithium secondary battery having the same; and is intended to reduce the risk of ignition or explosion by stopping the operation of the battery or lowering the activity of internal material when heat is abnormally generated by a malfunction or over-charging of the lithium secondary battery. A microcapsule for a lithium secondary battery according to the present invention comprises: a micro-sized cell wall which is made of thermoplastic resin and has a closed space formed therein; and a fire extinguishing composition contained in the closed space of the cell wall. Such a microcapsule may be included in at least one of an anode, a cathode, a separator, and electrolyte to fabricate a lithium secondary battery. Therefore, the lithium secondary battery usually operates normally. However, when excessive heat is generated by a malfunction or over-charging, the cell wall melts and discharges the fire extinguishing composition to the outside of the cell wall, thus stopping the operation of the lithium secondary battery and lowering the activity of the internal material, and thereby preventing the lithium secondary battery from igniting or exploding.