Aluminum member, aluminum-resin composite, and method for producing the aluminum-resin composite
In an aluminum member, a member body made of metal aluminum (a lid member and a positive terminal member) is formed, on its member surface, with protrusions (a lid upper-surface protrusion layer, a lid lower-surface protrusion layer, a terminal side-surface protrusion layer, a terminal lower-surface protrusion layer) having a nano-order diameter of less than 1 μm and a nano-order height of less than 1 μm, which are densely arranged. Proximal end portions of the protrusions, continuous to the member surface, contains amorphous alumina and α-alumina.
1 . A 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, 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 having a height of 20 nm from a root portion of said each protrusion and containing amorphous alumina and α-alumina, and
the proximal end portion of each protrusion of the protrusions 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
a resin member joined to the aluminum member; and
a non-aqueous electrolyte containing lithium hexafluorophosphate.
2 . The battery according to claim 1 , wherein an average height of the protrusions is in a range of 84 nm to 1000 nm.
3 . 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.
4 . The method according to claim 3 , wherein an average height of the protrusions is in a range of 84 nm to 1000 nm.