Fluorinated activated carbon is a special fluorinated carbon material synthesized from activated carbon, which has the same low surface energy, good chemical stability and thermal stability as fluorographite, and retains the well-developed pore structure of activated carbon. Fluorinated activated carbon is used as the cathode material of lithium fluorocarbon battery, the initial discharge voltage can be up to 3V and the specific capacity can be more than 600mAh/g.