LITHIUM ION SECONDARY BATTERY

A lithium ion secondary battery having excellent durability is provided. The lithium ion secondary battery includes: a positive electrode including a current collector made from aluminum; a negative electrode; and an electrolytic solution. The electrolytic solution contains an electrolyte including a lithium salt, and a linear carbonate represented by general formula (2) below, the linear carbonate is contained at a mole ratio of 3 to 6 relative to the lithium salt, and the electrolyte includes a first lithium salt represented by general formula (1) below and an alkali metal salt selected from general formulas (A) to (D) below. (RX)(RSO)NLi general formula (1) ROCOOR general formula (2) MPF(X)(y is an integer from 0 to 5) general formula (A) MBF(X)(y is an integer from 0 to 3) general formula (B) MAsF(X)(y is an integer from 0 to 5) general formula (C) MSiF(X)(y is an integer from 0 to 5) general formula (D)