Highly fluorinated graphite was prepared at room temperature using high oxidation state transition metal complex fluoride (K2PdF6, K2MnF6, K2NiF6 or KAgF4) and elemental fluorine under pressure ((5.9-11.8) x 10(5) Pa) in anhydrous liquid HF (aHF). The composition of the fluorinated graphite samples ranged from C-1.1 F to C1.9F containing small amounts of HE IR absorption spectra revealed that stage 1 phase of C,F contained several different phases with planar (sp(2)) and puckered (sp(3)) graphene layers. Electrochemical discharge of the fluorinated graphite showed that profile of discharge potential and discharge capacity varied depending on the amount of cointercalated HE The C,F samples with less amounts of HF and HF2delta- had relatively flat discharge potentials and large discharge capacities. The discharge capacity reached 500-600 mAh/g in 1 mol/dm(3) LiC1O(4)-propylene carbonate solution at 25 degreesC. Chemical diffusion coefficients of Li+ ion in the intermediate discharge products were (4.4-13) x 10(-12) cm(2)/s from impedance measurement. (C) 2004 Elsevier B.V. All rights reserved.