LITHIUM SECONDARY BATTERY

摘要

A lithium secondary battery having its internal resistance lowered, improved in cycle life, in which suppression of abnormal overheating and internal short circuiting mainly occurring during production is attained. There is provided a lithium secondary battery comprising a positive electrode constituted of a composite lithium oxide, a negative electrode constituted of a material capable of occlusion or release of lithium, a separator interposed between the positive electrode and the negative electrode and a nonaqueous electrolyte, wherein the separator is constituted of a nonwoven fabric and at least one of the positive electrode and the negative electrode has a porous membrane adhering to its surface, the porous membrane composed of an inorganic oxide filler and a binder. The thickness of the nonwoven fabric is preferably in the range of 15 to 50 mum. The nonwoven fabric preferably has a meltdown temperature of 150°C or higher.