A LiAl ingot was used to fabricate LiAl foil with a uniform thickness of 200 μm. A 300-g LiAl ingot composed of 80 wt % high-purity Li (99.99%) and 20 wt % granular Al powder (φ 2 to 3 μm) was formed by direct mixing of the components at 230 to 250°C for 30 to 35 min under an Ar atmosphere. After fine mixing, the ingot was cooled to room temperature and subsequently roll-pressed to obtain 30 m of 200-μm-thick LiAl foil. The roll-press process was also carried out in an inert Ar-filled atmosphere at the Honjo Metal facility in Japan and supplied by Honjo Metal Japan through The Kyung-In Synthetic Company (KISCO) Korea. The obtained LiAl foil was cut into circular disks (φ 15 mm) for the electrochemical measurements discussed in the following sections.

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