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Practical Reversibility of CuF2 in a Bulk-Type All-Solid-State Fluoride-Ion Battery
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-05-11 , DOI: 10.1021/acsenergylett.3c00459
Keiji Shimoda 1 , Yoshiyuki Morita 1, 2 , Kousuke Noi 1, 3 , Toshiharu Fukunaga 1 , Zempachi Ogumi 1 , Takeshi Abe 4
Affiliation  

Fluoride-ion batteries (FIBs), which use F ion migration to drive charge–discharge cycles, have recently gained academic attention as the next generation of rechargeable batteries. Copper difluoride (CuF2) represents a promising positive electrode material for FIBs owing to its high theoretical capacity and high redox potential. In this study, the high-temperature electrochemical reversibility of a CuF2 composite electrode in a bulk-type all-solid-state FIB is evaluated. The CuF2 composite electrode showed high reversible capacities during the initial cycling at operation temperatures as high as 200 °C and relatively good capacity retention up to the 30th cycle, even at 140 °C. It is suggested that the bulk-type battery operates through reversible fluoride-ion shuttling between CuF2 and the counter electrode via an F ion-conducting solid electrolyte. Furthermore, this study indicates that maintaining a CuF2/Cu particle size of less than 50 nm is important in fabricating bulk-type FIBs with good electrochemical performance.

中文翻译:

块状全固态氟离子电池中 CuF2 的实用可逆性

氟化物离子电池 (FIB) 使用 F -离子迁移来驱动充放电循环,最近作为下一代可充电电池受到了学术界的关注。由于其高理论容量和高氧化还原电位,二氟化铜 (CuF 2 ) 是一种很有前途的 FIB 正极材料。在这项研究中,评估了块状全固态 FIB 中CuF 2复合电极的高温电化学可逆性。CuF 2复合电极在高达 200 °C 的操作温度下的初始循环期间表现出高可逆容量,并且即使在 140 °C 下,直到第 30 次循环时仍具有相对良好的容量保持率。建议块状电池通过F -离子导电固体电解质在 CuF 2和对电极之间进行可逆的氟离子穿梭运行。此外,这项研究表明,保持 CuF 2 /Cu 粒径小于 50 nm 对于制造具有良好电化学性能的块状 FIB 很重要。
更新日期:2023-05-11
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