Reversible Formation and Decomposition of LiF Clusters Using Transition Metal Fluorides as Precursors and Their Application in Rechargeable Li Batteries

A LiF/M nanocomposite in which LiF is dispersed with a transition metal (TM) on an atomic or nanometer scale can be obtained by a complete electrochemical insertion of Li into TM fluoride. Thus Li–F bonds can be broken and reformed at room temperature, and Li can be reversibly stored in TM fluorides through heterogeneous solid‐state electrochemical reactions (see Figure).