| 摘要 |
PROBLEM TO BE SOLVED: To obtain high energy density, long life and improved safety in a lithium secondary battery. SOLUTION: The lithium secondary battery 10 comprises a positive electrode 4 having a positive electrode active material which is provided through a separator 6, a negative electrode 5 having a negative electrode active material and an electrolyte. In this, the negative electrode or the negative electrode current collector contains a substance which compensates the capacity deterioration of the negative electrode active material. This substance is a mixture of an amorphous substance which does not react with lithium and a substance which reacts with lithium. As an amorphous substance which does not react with lithium, silicon dioxide is preferable and as a substance which reacts with lithium, silver, aluminum, silicon or the like are preferable. With the above structure, a lithium secondary battery is realized which has an excellent charge and discharge cycle and high energy density as well as superior safety. |
