| abstract |
An object of the present invention is to provide a sulfur-based active material for a non-aqueous electrolyte secondary battery that is inexpensive and simply has a large charge/discharge capacity and excellent cycle characteristics, an electrode comprising the sulfur-based active material, and a non-aqueous electrolyte secondary battery having the electrode, and a non-aqueous electrolyte secondary battery having the electrode To provide a manufacturing method. According to the present invention, (1) thermally expansible particles having an outer shell comprising an acrylic copolymer and a hydrocarbon contained inside the outer shell, and having an expansion initiation temperature of 150 ° C. or less, and (2) sulfur A sulfur-based active material formed by calcining a raw material is provided. |