Method of manufacturing non-aqueous electrolyte solution secondary battery and non-aqueous electrolyte solution secondary battery

A method of manufacturing a non-aqueous electrolyte solution secondary battery, the method comprising:

• preparing a first composite material by mixing a first positive electrode active material, a first conductive material and a first binder;
• preparing a second composite material by mixing a second positive electrode active material, a second conductive material and a second binder;
• manufacturing a positive electrode by forming a positive electrode composite layer including the first composite material and the second composite material;
• and
• manufacturing the non-aqueous electrolyte solution secondary battery including the positive electrode, a negative electrode, and a non-aqueous electrolyte solution,
• the positive electrode composite layer being formed such that
• the first positive electrode active material has an average discharge potential lower than an average discharge potential of the second positive electrode active material,
• the first positive electrode active material has a mass ratio of 10 mass % or more and 50 mass % or less with respect to a total of the first positive electrode active material and the second positive electrode active material,
• the first conductive material has a first oil absorption number with respect to 100 parts by mass of the first positive electrode active material,
• the second conductive material has a second oil absorption number with respect to 100 parts by mass of the second positive electrode active material,
• a ratio of the second oil absorption number to the first oil absorption number is 1.3 or more and 2.1 or less, and
• a sum of the first oil absorption number and the second oil absorption number is 31.64 ml/100 g or less,
• wherein the first positive electrode active material has a first composition represented by LiNia1Cob1Mnc1O2 (formula (I)) where 0.3<a1<0.5, 0.4<b1<0.6, 0<c1<0.2, and a1+b1+c1=1, and
• the second positive electrode active material has a second composition represented by LiNia2Cob2Mnc2O2 (formula (II)) where 0.3<a2<0.5, 0.1<b2<0.3, 0.3<c2<0.5, and a2+b2+c2=1.