Carbon fluoride with a general formula (CFx)nrepresents an attractive cathode material for primary lithium cells operating in aprotic medium. (CFx)ncompound was obtained by the gaseous fluorination of carbon tissue at 450°C. The degree of fluorination, i.e. the value x for the final product, was equal to 0.95. During the electrochemical reduction of carbon fluoride, a ternary intercalated compound CLixF is formed which is chemically decomposed to carbon and lithium fluoride. Reduction process of (CFx)nis irreversible due to covalent C-F bonding with sp3hybridization. This discharge process was strictly controlled by diffusion of Li+into the layered host of carbon fluoride. X-ray method was applied for elucidation of reduction process.