| abstract |
An object of the present invention is to provide a lithium ion battery in which deterioration during storage at high temperature is suppressed. A positive electrode 3 capable of inserting and extracting lithium ions, a negative electrode 6 capable of inserting and extracting lithium ions, a separator 7 disposed between the positive electrode 3 and the negative electrode 6, and an organic electrolyte. In the lithium ion battery 100, the organic electrolyte solution includes a plurality of types of solvents, an additive, and an electrolyte, the electrolyte includes lithium hexafluorophosphate (LiPF 6 ), and the additive includes: Vinylene carbonate or a derivative thereof and the formula (I) (Wherein R 1 , R 2 and R 3 are each independently fluorine or a fluorinated alkyl group having 1 to 3 carbon atoms). [Selection] Figure 1 |