LITHIUM ION SECONDARY BATTERY, AND METHOD OF MANUFACTURING LITHIUM ION SECONDARY BATTERY

摘要

The present invention relates to a lithium ion secondary battery, and a producing method of a lithium ion secondary battery. The lithium ion secondary battery (1) comprises: a positive electrode plate (21) having a positive electrode active material layer (23) including a positive electrode active material particle (24); a negative electrode plate (31); and a non-aqueous electrolyte (40) having a compound including fluorine. A surface (24n) of the positive electrode active material particle (24) has a thin film (25) including fluorine and phosphorus. If the atom number of the fluorine in the thin film (25) is Cf and the atom number of the phosphorus in the thin film (25) is Cp, Cf/Cp is greater than or equal to 1.89 and less than or equal to 2.61.