| abstract |
(57) [Problem] To provide a non-aqueous electrolyte secondary battery provided with a polymer electrolyte, which can improve cycle characteristics and high-rate discharge characteristics. SOLUTION: A polymer material interposed between a positive electrode and a negative electrode to form a polymer electrolyte layer and a polymer material as a binder present in an active material layer have different structures. Thereby, the roles of improving the ion conductivity and the internal resistance, securing the strength of the battery, and suppressing the expansion and contraction of the active material layer are respectively shared, and the efficient discharge characteristics and the cycle characteristics can be improved. Further, the polymer electrolyte layer is formed of a polymer material having a degree of swelling due to the electrolytic solution larger than the polymer material constituting the binder. Thereby, in the polymer electrolyte layer, ionic conductivity can be increased and internal resistance can be reduced. In the active material layer, strength can be secured and expansion and contraction can be suppressed, and high-rate discharge characteristics and cycle characteristics can be improved. . |