title: High energy density rechargeable magnesium battery using earth-abundant and non-toxic elements.
abstract: Rechargeable magnesium batteries are poised to be viable candidates for large-scale energy storage devices in smart grid communities and electric vehicles. However, the energy density of previously proposed rechargeable magnesium batteries is low, limited mainly by the cathode materials. Here, we present new design approaches for the cathode in order to realize a high-energy-density rechargeable magnesium battery system. Ion-exchanged MgFeSiO4 demonstrates a high reversible capacity exceeding 300 Ah · g(-1) at a voltage of approximately 2.4 V vs. Mg. Further, the electronic and crystal structure of ion-exchanged MgFeSiO4 changes during the charging and discharging processes, which demonstrates the (de)insertion of magnesium in the host structure. The combination of ion-exchanged MgFeSiO4 with a magnesium bis(trifluoromethylsulfonyl)imide-triglyme electrolyte system proposed in this work provides a low-cost and practical rechargeable magnesium battery with high energy density, free from corrosion and safety problems.
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Orikasa
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Titus
authors.initials: T
authors.lastname: Masese
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JAPAN.
authors.forename: Yukinori
authors.initials: Y
authors.lastname: Koyama
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Takuya
authors.initials: T
authors.lastname: Mori
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Masashi
authors.initials: M
authors.lastname: Hattori
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Yamamoto
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Okado
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Zhen-Dong
authors.initials: ZD
authors.lastname: Huang
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JAPAN.
authors.forename: Taketoshi
authors.initials: T
authors.lastname: Minato
authors.affiliation: 1] Graduate School of Engineering, Kyoto University, Katsura-cho, Nishikyo-ku, Kyoto 615-8510, JAPAN [2] The Hakubi Center for Advanced Research, Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8302, JAPAN.
authors.forename: Cédric
authors.initials: C
authors.lastname: Tassel
authors.affiliation: Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, JAPAN.
authors.forename: Jungeun
authors.initials: J
authors.lastname: Kim
authors.affiliation: Graduate School of Engineering, Kyoto University, Katsura-cho, Nishikyo-ku, Kyoto 615-8510, JAPAN.
authors.forename: Yoji
authors.initials: Y
authors.lastname: Kobayashi
authors.affiliation: Graduate School of Engineering, Kyoto University, Katsura-cho, Nishikyo-ku, Kyoto 615-8510, JAPAN.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Abe
authors.affiliation: 1] Graduate School of Engineering, Kyoto University, Katsura-cho, Nishikyo-ku, Kyoto 615-8510, JAPAN [2] Institute for Integrated Cell-Material Sciences, Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8302, JAPAN.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kageyama
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, JAPAN.
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Uchimoto