Non-aqueous electrolyte secondary battery comprising lithium vanadium phosphate and lithium nickel composite oxide as positive electrode active material

In a non-aqueous electrolyte secondary battery, a positive electrode active material includes a carbon-coated lithium vanadium phosphate and a lithium nickel composite oxide. A negative electrode active material includes a carbon-based active material capable of intercalating and deintercalating lithium ions. When a first charge capacity of a negative electrode per unit area is "x" (mAh/cm 2 ), and a first charge capacity of a positive electrode per unit area is "y" (mAh/cm 2 ), a relation of "x" and "y" satisfies 0.6 ¤ y/x ¤ 0.92.