NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

To provide a nonaqueous electrolyte secondary battery that suppresses elution of Al from a positive electrode current collector formed of aluminum or an aluminum alloy, and is superior in thermal characteristics and input-output characteristics. Provided is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode has a positive electrode current collector formed of aluminum or an aluminum alloy. The electrolytic solution contains a metal salt and an organic solvent having a heteroelement. Regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum of the electrolytic solution, Is>Io is satisfied when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is.

主权项

1. A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and an electrolytic solution, wherein
the positive electrode has a positive electrode current collector formed of aluminum or an aluminum alloy, the electrolytic solution contains a salt whose cation is an alkali metal, an alkaline earth metal, or aluminum, and an organic solvent having a heteroelement, and, regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum of the electrolytic solution, Is>Io is satisfied when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is, or d/c obtained by dividing a density d (g/cm3) of the electrolytic solution by a concentration c (mol/L) of the electrolytic solution is within a range of 0.15≦d/c≦0.71.