Abstract
Highly fluorinated graphites have been synthesized by using elemental fluorine under pressure and high oxidation state complex fluoride, K 2NiF 6 or KAgF 4 in anhydrous hydrogen fluoride. Their electrochemical discharge as a cathode of primary lithium battery has been investigated in organic electrolyte solution. Main products were stage 1 compounds or the stage 1 involving stage 2 and 3 phases as minor components with approximate compositions of C 1.6F. X-ray photoelectron spectra indicated the existence of nearly semi-ionic C–F bonds. Electrochemical studies demonstrated that the C x F samples prepared using KAgF 4 and elemental fluorine exhibited high and flat discharge potentials of 3.2 V versus Li/Li + and discharge capacities of ∼500 mA h g −1 at cut-off potential 1.5 V.
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