• • The CrOx/10%eCFx composite achieves an energy density of 496.59 Wh kg−1 at a power density of 49.7 kW kg−1 (50 C), outperforming pure CrOx and CFx electrodes, indicating a significant enhancement in high-rate capability.
• • The synergetic effect involves fluorine migration from CFx to CrOx, resulting in homogeneous LiF distribution and improved ionic/electronic conductivity, which is critical for mitigating the resistive accumulation of LiF that typically limits CFx rate performance.
• • The composite cathode addresses the low practical capacity of CrOx (due to CrO3 fusion during calcination) and the poor rate capability of CFx, offering a balanced solution for high-energy, high-power lithium primary batteries.
• • The work demonstrates a rational design strategy for composite cathodes by regulating discharge potential overlap, providing a pathway to revitalize lithium primary batteries for demanding applications.