Patent ID: 11581566

Abstract:
One of the objects of the present invention is to suppress a short circuit due to metal deposition in an insulating layer in a secondary battery in which a positive electrode and a negative electrode are disposed to face each other via the insulating layer. The secondary battery comprises a battery element including at least one positive electrode 11 and at least one negative electrode 12, and a casing that seals the battery element together with an electrolyte. At least one of the positive electrode 11 and the negative electrode 12 comprises a current collector, an active material layer formed on at least one surface of the current collector, and an insulating layer 112 formed on the surface of the active material layer. The electrolyte comprises an electrolyte component and a crosslinked gelling agent. The gelling agent exists at least between the active material layer of the positive electrode 11 and the active material layer of the negative electrode 12, and the ratio Rg of the gelling agent to 100% by mass of the electrolyte component in between the active material layer of the positive electrode 11 and the active material layer of the negative electrode 12 is 0<Rg≤5% by mass.