Lithium secondary battery having PTC powder and manufacturing method thereof

• Main Authors: KIM, JU-DAM, HAN, JUN-KU, CHOI, SU-AN, LEE, AN-NA, KO, CHANG-MO, LEE, JONG-HWAN
• Format: Patent
• Language: Chinese; English
• Published: 16.04.2005
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Disclosed is a lithium secondary battery with high stability and excellent performance, and its manufacturing method. The lithium secondary battery includes: a positive electrode including a active material of positive electrode, a conductive material and a binding material; and a negative electrode including an active material of negative electrode and a binding material, and PTC powder is contained in at least one of the positive electrode and the negative electrode. If the battery is overheated due to overcharge, the PTC powder contained in the positive electrode and/or the negative electrode abruptly increases the electric resistance to break the electric current, thereby preventing further increase of temperature and resultantly preventing fire or explosion. In addition, the conductive material is contained separately from the PTC powder; therefore, the performance of the battery is not deteriorated in the normal operation.