Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery, comprising:

• a positive electrode including a positive electrode active material;
• a negative electrode;
• and
• a non-aqueous electrolyte, wherein
• the positive electrode includes:
• a lithium-transition metal composite oxide (A) having a median diameter on a volumetric basis (D50) of 0.6 μm to 3 μm and being a secondary particle formed by aggregation of primary particles having an average particle diameter of 0.5 μm or larger or being composed of substantially single particles;
• and a lithium-transition metal composite oxide (B) having a median diameter on a volumetric basis (D50) of 6 μm to 25 μm and being a secondary particle formed by aggregation of primary particles having an average particle diameter of 0.3 μm or smaller, as the positive electrode active material;
• the lithium-transition metal composite oxide (A) contains 65 mol % or more of Ni based on a total number of moles of metal elements excluding Li;
• the lithium-transition metal composite oxide (B) contains 70 mol % or more of Ni based on a total number of moles of metal elements excluding Li, and Ti is present on a particle surface of the oxide;
• and
• in the lithium-transition metal composite oxide (B), when particles having a particle diameter larger than a 70% particle diameter (D70) on a volumetric basis are defined as first particles, and particles having a particle diameter smaller than a 30% particle diameter (D30) on a volumetric basis are defined as second particles,
• a mole fraction of Ti based on a total number of moles of metal elements excluding Li on surfaces of the second particles (B2) is larger than a mole fraction of Ti based on a total number of moles of metal elements excluding Li on surfaces of the first particles (B1).