| abstract |
PROBLEM TO BE SOLVED: To improve a cycle performance in a 5V class non-aqueous electrolyte secondary battery while ensuring a high operating voltage and reliably forming a uniform film on a negative electrode surface. SOLUTION: The positive electrode contains a 5V class positive electrode active material, and the negative electrode has a negative electrode active material capable of inserting and removing lithium ions, and the positive electrode potential at the end of charging is 4.5 V (vsLi / Li + ) or more. This is a non-aqueous electrolyte secondary battery. The positive electrode further contains, as a second component, a positive electrode active material having an initial charge electric quantity of 50 mAh / g or more in a charging region of less than 4.5 V (vsLi / Li + ), and the second component positive electrode active material is 1 to 9% by weight based on the total weight of the positive electrode active material. [Selection] Figure 3 |