Manufacturing method of battery material

Abstract

To improve a Li collection rate when reproducing a battery material from a lithium ion secondary battery.SOLUTION: A manufacturing method disclosed here, contains: a preparation step of preparing a lithium ion secondary battery that has been charged to a predetermined reference SOC or more; a filling step of filling an aqueous medium into an internal part of the lithium ion secondary battery; and a collection step of collecting the aqueous medium from the internal part of the lithium ion secondary battery. Thus, Li solution into which Li in a negative electrode active material is eluted into the aqueous medium can be prepared. Then, a large amount of Li can be easily collected by collecting the Li solution.SELECTED DRAWING: Figure 3

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