| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery which is arranged so that the reduction of an amount of gas generation at overcharge can be suppressed.SOLUTION: A nonaqueous electrolyte secondary battery comprises: a positive electrode; a negative electrode; a nonaqueous electrolyte including a gas-generating additive agent which generates gas by performing a decomposition reaction on the positive electrode at overcharge; and a current cut-off part for cutting off electric current according to the generated gas. The positive electrode includes: a positive electrode current collector; and a positive electrode mixture layer provided on the surface of the positive electrode current collector. The positive electrode mixture layer includes composite particles including a positive electrode active material, a conductive material, and a binder. The positive electrode mixture layer has a density of 2.5-2.9 g/cm. Particle diameters (median diameter D50) of the composite particles are substantially the same as a thickness of the positive electrode mixture layer. |
