Enhancing Semi‐Ionic C–F Bond Ratio of the Carbon Fluoride Cathodes With High Conductivity for Primary Lithium Batteries

For lithium/carbon fluoride (Li/CF X ) battery, due to the strong covalent nature of the C–F bond, CF X exhibits very low electronic conductivity and is prone to polarization, resulting in poor rate performance of Li/CF X batteries, which cannot meet high‐power discharge requirements. In this work, a sodium hydroxide (NaOH) reduction method is employed to chemically modify CF X with low‐temperature calcination at 450°C. This process significantly increased the proportion of semi‐ionic C–F bonds by 7%, while reducing the covalent C–F bonds by ≈20%. The increased semi‐ionic C–F bond ratio enhances electron transport efficiency and facilitates Li + diffusion, leading to substantially improved discharge voltage plateaus and specific capacities at high rates. The optimized CF X ‐Mg composite with 0.5% Mg doping achieves a maximum discharge rate of 15 C with a discharge capacity of 686 mAh g −1 , an energy density of 1.09 × 10 3 Wh kg −1 at 0.5 C, and a peak power density of 1.68 × 10 4 W kg −1 . Additionally, it demonstrates excellent performance across a wide temperature range (−10 to 60°C). This research provides a novel and effective approach for developing high‐performance cathode materials for Li/CF X batteries.