Importance

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Abstract

Provided is a recovery method of an active material for recovering an active material from an all-solid-state secondary battery member including an active material layer which contains the active material and an oxide-based solid electrolyte, the method including bring the all-solid-state secondary battery member into contact with an aqueous medium, and performing solid-liquid separation, in which the oxide-based solid electrolyte includes a solid electrolyte which contains a lithium-containing oxide containing Li, B, and O, a lithium salt, and water, and in the solid electrolyte, a value of a ratio of a content of the lithium salt to a content of the lithium-containing oxide is 0.001 to 1.5 in terms of a molar ratio, and a value of a ratio of a content of the water to the content of the lithium-containing oxide is 1 to 12 in terms of a molar ratio.

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First Claim