| abstract |
Disclosed is a lithium ion secondary battery including: a positive electrode, a negative electrode including a negative electrode active material layer comprising an alloy-type active material, a lithium ion-permeable insulating layer interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The negative electrode active material layer includes lithium which has been absorbed therein beforehand. The non-aqueous electrolyte includes a lithium salt and a non-aqueous solvent, and the non-aqueous solvent includes: at least one fluorine-containing compound selected from hydrogen fluoride and a specific fluoroethylene carbonate compound (A); and a carbonate-based solvent (B) other than the fluoroethylene carbonate compound (A). |