| abstract |
In the lithium ion secondary battery according to an embodiment of the present invention, the electrode is composed of an electrode active material, a conductive aid, and a binder composed of a binding component and a melting point depressant, and the The binding component binds the conductive aid to form a conductive path between the electrode active materials, and the melting point lowering agent lowers the melting point of the binding component. The melting point lowering agent is a PTC function imparting component that lowers the melting start temperature of the binder and imparts the PTC function to the lithium ion secondary battery. In the lithium ion secondary battery of the present invention, when short-circuit heat generation occurs in the battery due to conductive foreign matter, the binding material in the vicinity of the foreign matter is melted to cut off the conductive path. |