Abstract
Recent new development in graphite intercalation compounds (GICs) with alkali metals was reviewed. GICs with high alkali metal content were synthesized under high pressures, being exampled by LiC2 and KC4, and also in the presence of small amount of oxygen, exampled by KC3.7O0.07 and NaC6O0.5. Binary alkali metal-GICs were synthesized in 2-methyltetrahydrofuran (MeTHF) by spontaneous chemical reaction, even though ternary GICs, such as K-THF-GIC, were usually obtained in most organic solvents. Binary GICs were also obtained in propylenecarbonate (PC) by electrochemical reaction. These experimental results strongly suggest that the third component such as oxygen, MeTHF, etc. has certain effect on the intercalation reactions of alkali metals into graphite gallery. Possible mechanisms were discussed.
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