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Fluoride-Ion Shuttle Battery with High Volumetric Energy Density

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journal contribution
posted on 29.12.2020, 02:29 by Hiroyuki Nakano, Toshiyuki Matsunaga, Takuya Mori, Koji Nakanishi, Yoshiyuki Morita, Kazuto Ide, Ken-ichi Okazaki, Yuki Orikasa, Taketoshi Minato, Kentaro Yamamoto, Zempachi Ogumi, Yoshiharu Uchimoto
With the increasing development of electric vehicles and portable devices, there is a strong requirement for high-energy batteries. To improve battery energy, multielectron transfer electrode reactions can be applied. Previously, batteries based on fluoride-ion shuttle (F ion shuttle batteries, FiBs) have been reported, utilizing electrodes with multielectron transfer reactions. Although these FiBs exhibit high theoretical energy densities, reported capacities are significantly less than theoretical values. Moreover, charge–discharge mechanisms are not clarified. In this study, the feasibility of FiBs as extremely high-energy batteries has been demonstrated using a model cell with a Cu cathode and a LaF3 anode. By conducting experiments under an atmosphere without impurities, the Cu/LaF3 battery has been successfully operated with almost theoretical capacity. The Cu/LaF3 battery has been exhibited a superior cycle life at 80 °C, with feasibility for room-temperature operation.