| abstract |
(57) [Problem] To provide a non-aqueous electrolyte secondary battery having improved high-temperature charge / discharge cycle life and high-temperature storage / recovery characteristics. SOLUTION: A positive electrode capable of storing and releasing lithium, a negative electrode capable of storing and releasing lithium, a separator, and a non-aqueous electrolyte are provided. The positive electrode includes a chalcogen compound as an active material, and the negative electrode includes a current collector. Contains two or more kinds of carbonaceous materials and a binder as a negative electrode material supported on the non-aqueous electrolyte, the non-aqueous electrolyte contains a non-aqueous solvent containing γ-butyrolactone as a main component, and the charge capacity of the positive electrode is P c (mAh / g), the basis weight is P p (g / m 2 ), the charge capacity of the negative electrode is N c (mAh / g), and the basis weight is N p (g / m 2 ). And the capacity ratio between the positive electrode and the negative electrode (C ratio ) is C ratio = (P When expressed as ( c × P p ) / (N c × N p ), the capacitance ratio is 0.724 to 0.914. |