[14a-PA2-1~18] 9.2 Nanoparticles, Nanowires and Nanosheets

[14a-PA2-1] Formation of Fe nanoparticles after discharge for the FeF₃ cathode

〇Tsuyoshi Takami¹, Keitaro Matsui², Masahiro Shikano², Hikari Sakaebe², Toshiharu Fukunaga¹ (1.Kyoto Univ., 2.AIST)

Keywords:battery, nanoparticles, cathode

Fluoride cathode materials that undergo conversion reactions such as FeF₃ have attracted increasing interest owing to their high energy density. However, the ability of FeF₃ to maintain a high capacity over repeated cycles and the decisive factor dominating conversion reactions have yet to be elucidated. By optimizing the choice of lithium salts and electrolyte solutions, we were able to achieve good capacity retention for an FeF₃-based cathode, that is, 4.5-fold enhancement compared with a model electrode (372 mAh/g after 30 cycles). Fe particle size after discharge plays a crucial role for realizing higher capacities.