| abstract |
An object of the present invention is to provide a novel positive electrode which is made by using an inexpensive rubber and can improve the charge-discharge capacity and cycle characteristics of the lithium ion secondary battery, and a lithium ion secondary battery comprising the positive electrode . In the lithium ion secondary battery, the positive electrode includes a current collector and an electrode layer formed on a surface of the current collector, wherein the electrode layer includes an active material, a conductive additive, and a thermosetting resin binder subjected to a thermosetting treatment, And a sulfur-based positive electrode active material prepared by heat-treating a raw material containing sulfur in a non-oxidizing atmosphere. |