Electrolytic lamellar compounds of graphite with well-defined oxidation stages were indicated by characteristic changes in the potential of a graphite anode during galvanostatic oxidation in nonaqueous, aprotic electrolytes. In analogy to the well-known graphite salts in acid media e. g. C 24 HSO 4 ·2 H 2 SO 4 1,2 a C n -stage with n = 24 besides others with n>24 was obtained in solutions of LiClO 4 , NaBF 4 or KPF 6 in propylene carbonate; further oxidation of graphite does not cause significat changes in the potential of the electrode. Such defined stages of oxidation were observed at graphite anodes in various nonaqueous electrolytes. According to the present results simple salt-like lamellar compounds of the general type C n X are proposed; contrary to graphite salts prepared in concentrated acids, intercalation of free electrolyte is not a matter of priciple.
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Besenhard et al. (1972) studied this question.
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