| abstract |
Disclosed is a lithium ion battery which can prevent decomposition of a solvent used in an electrolytic solution and can maximize the energy density inherent to a positive electrode active material and a negative electrode active material. A lithium salt is dissolved in a positive electrode side solvent consisting of a first ionic liquid and / or a first organic solvent on the positive electrode 1 side, with a separator 3 made of an inorganic solid electrolyte having lithium ion conductivity as a boundary. A negative electrode side electrolyte solution 7 comprising a positive electrode side electrolyte solution 5 and a positive electrode active material 6, wherein a lithium salt is dissolved in a negative electrode 2 side solvent comprising a second ionic liquid and / or a second organic solvent on the negative electrode side; And a negative electrode active material 8. The positive electrode side solvent has a potential window at least in a potential region where the positive electrode active material undergoes a redox reaction, and the negative electrode side solvent has a potential window at least in a potential region where the negative electrode active material undergoes a redox reaction. [Selection] Figure 1 |