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Deintercalation and Thermal Stability of Na-graphite Intercalation Compounds

Na alloyed graphite intercalation compounds with stage 1 and 2 were synthesized using the high temperature and pressure technique. Thermal stability and staging transitions of the compounds were investigated depending on heating rates. The thermal stability and temperature dependence of the deintercalation compounds were characterized using differential scanning calorimeter (DSC) analyzer. Enthalpy of formations were confirmed at temperatures between 25 and 500 o C, depending on the various heating rates. The structure changes of Na alloyed graphite compounds during the deintercalation reaction of sodium ions and interlayer spaces of the graphite were identified by X-ray diffraction (XRD). Diffractograms of stages with non-integral (00l) values were obtained in the thermal decomposition process, and stacking disorder defects and random stage modes were observed. The average value of the interlayer C-C bond lengths were found approximately 2.12 A and 1.23 A from the diffractions. Based on the stage transition, the degree of the deintercalaton has a inverse-linear relationship against the hea ting rate.