Battery packaging material, manufacturing method therefor, battery, and aluminum alloy foil

A battery packaging material comprising a laminate including at least a base material layer, an aluminum alloy foil layer, an adhesive layer, and a heat-sealable resin layer in this order,

• wherein:
• the battery packaging material has a sealing strength at 25° C. of 110 to 200 N/15 mm,
• the laminate further comprises a lubricant that is:
• present on a surface of the heat-sealable resin layer in an amount of about 3 to 15 mg/m2 in an environment of a temperature of 24° C. and a relative humidity of 60%, and
• contained in the heat-sealable resin layer,
• a total thickness of the laminate is 60 to 190 μm,
• the adhesive layer has a logarithmic decrement ΔE of 0.30 or less in rigid pendulum measurement at 120° C.,
• the aluminum alloy foil layer has a chemical composition comprising:
• Si:
• 0.02 to 0.03% by mass,
• Fe:
• 1.2 to 1.7% by mass,
• Cu:
• 0.05% by mass or less,
• each element other than Al, Si, and Fe:
• 0.05% by mass or less, a total content of elements other than Al, Si, and Fe being 0.15% by mass or less, and
• Al:
• balance,
• an average area of second phase particles in a cross section of the aluminum alloy foil is 5 to 25 μm2,
• in 100 arbitrary second phase particles within a field of view of an optical microscope in a cross section in the thickness direction of the aluminum alloy foil layer, an average of diameters y of 20 second phase particles ranked in descending order by the diameter y from first to 20th among the 100 arbitrary second phase particles is 5.0 μm or less wherein the diameter y is a maximum direct distance between a point on an edge of one second phase particle among the 100 arbitrary second phase particles and a different point on the edge of the second phase particle, and
• in 100 arbitrary crystal grains of the aluminum alloy foil layer located within a field of view of a scanning electron microscope in a cross section in a thickness direction of the aluminum alloy foil layer:
• an average crystal grain diameter is 4.0 μm or more and 10.0 μm or less, the average crystal grain diameter being an average of maximum diameters x of the 100 arbitrary crystal grains of the aluminum alloy foil layer wherein the maximum diameter x is a maximum direct distance between a point on an edge of one crystal grain among the 100 arbitrary crystal grains and a different point on the edge of the crystal grain, and
• a standard deviation of the average crystal grain diameter is 5.0 μm or less.