Ultrathin Magnesium Metal Anode – An Essential Component for High‐Energy‐Density Magnesium Battery Materialization

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  • Toshihiko Mandai
    Center for Green Research on Energy and Environmental Materials Center for Advanced Battery Collaboration National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
  • Hidetoshi Somekawa
    Research Center for Structural Materials National Institute for Materials Science (NIMS) 1-2-1 Sengen Ibaraki 305-0047 Japan

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<jats:title>Abstract</jats:title><jats:p>The practical loading, i. e., thickness, of metal anodes predominates the practical energy density of batteries that incorporate elemental metals as anode active materials. Despite its significance for achieving high‐energy‐density rechargeable magnesium batteries (RMBs), the application of ultrathin magnesium foils remains a challenge because of the brittleness and unworkability of magnesium. This work provides a critical component of a geometric size applicable to laminate‐type cells of dimensions 42×32 mm<jats:sup>2</jats:sup> or larger. Ultrathin magnesium foil without cracked edges can be fabricated by controlling the initial microstructure. Furthermore, the rolling temperature determines the resulting microstructure and thus the electrochemical properties. The optimal sample, a warm‐rolled magnesium foil, exhibited excellent electrochemical characteristics owing to its favorable microstructure, which facilitated a homogeneous distribution of reaction sites. Battery performance using such ultrathin magnesium anodes was investigated with MgMn<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> and α‐MnO<jats:sub>2</jats:sub> cathodes. Considering the weights of both the cathodes and anodes, the gravimetric energy density of primitive [α‐MnO<jats:sub>2</jats:sub> || pMg] cells was estimated to be 72 Wh kg<jats:sub>electrode</jats:sub><jats:sup>−1</jats:sup>.</jats:p>

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