Cu–Pb Nanocomposite Cathode Material toward Room-Temperature Cycling for All-Solid-State Fluoride-Ion Batteries
Datong Zhang, Takahiro Yoshinari, Kentaro Yamamoto, Y. Kitaguchi, Aika Ochi, Koji Nakanishi, Hidenori Miki, Shinji Nakanishi, Hideki Iba, Toshiki Watanabe, Tomoki Uchiyama, Yuki Orikasa, Koji Amezawa, Yoshiharu Uchimoto
Abstract
All-solid-state fluoride-ion batteries (FIBs) are regarded as attractive alternatives to traditional energy storage systems because of their high energy density; however, they are not applicable at room temperature owing to sluggish ion transport in both the electrolyte and electrode. In this study, a rational design of a Cu–Pb nanocomposite is reported, which was tested as a room-temperature cathode material for all-solid-state FIBs. Following electrochemical pretreatment, self-generated PbF2 could act as a fast fluoride-ion conductor and consequently enhance the kinetics of the Cu/CuF2 phase transition process upon cycling. The detailed reaction mechanism and phase transition process were verified using the X-ray absorption near edge structure. The Cu–Pb nanocomposite could realize reversible (de)fluorination at room temperature with high performance and good cyclability.