Amorphous redox host‐enhanced fluoride conversion electrochemistry for high‐performance lithium‐ion batteries

Abstract Transition metal fluorides hold promise for high‐energy lithium‐ion batteries but suffer from irreversible regeneration and sluggish kinetics. Here, an amorphous composite cathode strategy to overcome these limitations is proposed. In the fabricated amorphous LiF–Co–Mo (a‐LCM) composite cathodes, LiF nanoclusters are embedded in a disordered Co/Mo matrix. This unique Schottky heterojunction enables reversible order–disorder transitions during cycling, bypassing crystalline lattice constraints. The a‐LCM cathode delivers an initial discharge capacity of 602 mAh g −1 with 75% retention after 100 cycles, achieving a high energy density of 918 Wh kg −1 and energy efficiency of 70.6%. Structural analyses reveal surface‐dominated conversion mechanisms, where the amorphous matrix promotes LiF regeneration while suppressing bulk degradation. Unlike conventional composites requiring excessive conductive additives, the additive‐free a‐LCM leverages intrinsic metallic conductivity and interfacial Li + transport pathways. This work establishes amorphous engineering as a transformative approach to reconcile energy density and cyclability in conversion‐type cathodes, offering new design principles for high‐performance fluoride‐based lithium‐ion batteries.