Patent ID: 8354180

Claim:
A method for exfoliating an active material layer of an electrode plate for a storage battery, in a process of exfoliating the active material layer from a substrate of an electrode plate for a storage battery in which the electrode plates formed by coating or filling the substrates with the active material layer are positioned opposite each other with a separator interposed therebetween, the method comprising: in a process of exfoliating the active material layer from an interface between the substrate of an electrode plate for a storage battery and the active material layer, immersing the electrode plates for a storage battery in an aqueous solution containing a phosphoric acid, an ethoxy alcohol, ammonium bifluoride, a sulfonic acid, and sodium xylenesulfonate as solutes, and wherein percentage contents of the solutes in the aqueous solution are 15 to 20 parts by mass of the phosphoric acid; 3 to 7 parts by mass of the ethoxy alcohol; 2 to 6 parts by mass of the ammonium bifluoride; 4 to 8 parts by mass of the sulfonic acid; and 1 to 3 parts by mass of the sodium xylenesulfonate, wherein the active material layer is exfoliated in the form of a layer comprising at least one active material and a binder; and removing the active material layer from the solution to recover the active material.