NOVELTY - A lithium ion secondary battery (100) comprises positive electrode layer (110) containing positive electrode active material particle (111) covered with lithium oxide-zirconium oxide, negative electrode layer (120), and sulfur-type solid electrolyte layer (130) which contains lithium sulfide and phosphorus pentasulfide and is positioned between positive electrode layer and negative electrode layer. Ratio of coating volume of lithium oxide-zirconium oxide with respect to total amount of positive electrode active material particle and lithium oxide-zirconium oxide is 0.1-2 mol.%.    USE - A lithium ion secondary battery for portable electronic device, portable information terminal, power storage apparatus, and vehicles.    ADVANTAGE - Reaction between interface of positive electrode active material and solid electrolyte can be inhibited, and rate and cycling characteristics of lithium ion secondary battery can be improved.    DETAILED DESCRIPTION - A lithium ion secondary battery (100) comprises positive electrode layer (110) containing positive electrode active material particle (111) covered with lithium oxide-zirconium oxide (aLi2O-ZrO2), negative electrode layer (120), and sulfur-type solid electrolyte layer (130) which contains lithium sulfide (Li2S) and phosphorus pentasulfide (P2S5) and is positioned between positive electrode layer and negative electrode layer. Ratio of coating volume of aLi2O-ZrO2 with respect to total amount of positive electrode active material particle and aLi2O-ZrO2 is 0.1-2 mol.%.    a=0.1-2.    An INDEPENDENT CLAIM is included for manufacture of positive electrode active material for lithium ion secondary batteries which involves mixing positive electrode active material particle, lithium alkoxide, and zirconium alkoxide in alcohol solution, carrying out evaporation drying of alcohol, irradiating ultrasonic wave to mixed solution, heating at less than or equal to 750 degrees C, and obtaining positive electrode active material particle coated with aLi2O-ZrO2.    DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory diagram of the lithium ion secondary battery.    Lithium ion secondary battery (100)    Positive electrode layer (110)    Positive electrode active material (111)    Negative electrode layer (120)    Solid electrolyte layer (130)