| abstract |
In a lithium secondary battery using a silicon-containing material as a negative electrode active material, a lithium secondary battery having high capacity and excellent charge / discharge cycle characteristics is provided by improving the positive electrode, particularly by improving the positive electrode active material. Is the main purpose. A lithium secondary battery having a negative electrode 2 containing silicon as a negative electrode active material, a positive electrode 1 containing a positive electrode active material, and a nonaqueous electrolyte, wherein the positive electrode active material includes a lithium transition metal composite. An oxide and a lithium-containing material having a charging potential at a potential lower than 3.5 V with respect to a metallic lithium potential are included. [Selection] Figure 1 |