Aluminum member, aluminum-resin composite, and method for producing the aluminum-resin composite

A method of producing a battery, the battery comprising:

• an aluminum-resin composite composed of:
• an aluminum member made of metal aluminum, having a member surface on which protrusions are densely arranged,
• a resin member joined to the aluminum member;
• and
• a non-aqueous electrolyte containing lithium hexafluorophosphate, the method comprising:
• forming the protrusions on the member surface by laser irradiation to the member surface to be formed with protrusions, the protrusions each having a nano-order diameter of less than 1 μm and a nano-order height of less than 1 μm, wherein
• each protrusion of the protrusions includes a proximal end portion continuous to the member surface,
• the proximal end portion has a height of 20 nm from a root portion of said each protrusion and contains amorphous alumina and α-alumina, and
• the proximal end portion of each protrusion contains a higher mass ratio of α-alumina to amorphous alumina than in a region more than 20 nm from the root portion of said each protrusion;
• and
• after forming the protrusions, forming the resin member on the member surface by insert molding.