Development of Fluoride Ion Conductors for Battery Application

• Published in: Funtai Kogakkaishi Vol. 59; no. 11; pp. 589 - 595
• Main Author: Mineshige, Atsushi
• Format: Journal Article
• Language: Japanese
• Published: Kyoto The Society of Powder Technology, Japan 10.11.2022; Japan Science and Technology Agency
• Subjects: Ceramics; Circuits; Conductors; Electrodes; Fluoride ion conductor; Ion currents; Ion migration; Mechanochemical synthesis; Solid electrolyte; Solid electrolytes
• ISSN: 0386-6157; 1883-7239
• DOI: 10.4164/sptj.59.589

In order to operate a battery, current must flow smoothly not only in the external circuit but also inside the battery to form a “current loop”. Between electrodes, in many cases, electrons and ions carry charges in the external circuit and inside the battery, respectively. Therefore, it is necessary to minimize the electrode reaction resistance and the ion migration resistance between the electrodes in order to develop highly efficient batteries. For the latter, the key technology is the development of electrolyte materials with excellent ionic conductivity in addition to shorten the distance between the electrodes. In this paper, we use fluoride ion (F−) conductors as an example to explain design guidelines for solid electrolyte materials that contribute to the development of high energy density batteries. In addition, applying the mechanochemical synthesis will be discussed since it has advantages to obtain novel materials that cannot be synthesized by existing methods.