Cup-stacked carbon nanotubes (Cup-CNTs) was fluorinated in a temperature range RT-500• •by 0.5–1 atm elemental fluorine. The F/C atomic ratio (CF0.4-CF1.2) and the color are strongly dependent on the fluorination conditions. The color of fluorinated Cup-CNTs (F-Cup-CNTs) varies from black, through gray and yellow to white. The form and morphology of the pristine tubes were well preserved after fluorination, and the fluorination results in the functionalization and modification of pristine Cup-CNTs with respect to electrochemical properties. The F-Cup-CNTs as cathodes for primary Li cells discharge satisfactorily with 100% cathode utility.