LITHIUM ION SECONDARY BATTERY

A lithium ion secondary battery which meets the requirement [1] of satisfying the formulae (a) to (c) or the requirement [2] of satisfying the formulae (b), (d), and (e): (a) 5 ≤ A ≤ 25, (b) 10 ≤ B ≤ 60, (c) 40 ≤ 2A + B ≤ 90, (d) 0.2 ≤ C ≤ 1.2, and (e) -80 ≤ 200C - 3B ≤ 150, wherein A (µm) represents an average particle size of a positive electrode active material; B (vol.%) represents a volume concentration of a fluorinated ether in a nonaqueous electrolyte solution; and C (m/g) represents a specific surface area of the positive electrode active material.