メカニカルアロイングによるC-Li層間化合物の作製 Synthesis of C-Li Intercalation Compounds Subjected to Mechanical Alloying
The crystal structure of graphite is characterized by layers. The large separation (3.35Å between layers compared with the C-C bond length of 1.42Å in the layers indicates relatively feeble binding between the atoms of different layers. Up to date, graphite intercalation compounds with many kinds of atoms and molecules have been reported. In this work mechanical alloying (MA) was employed to synthesize graphite-lithium intercalation compounds. By X-ray diffraction, (002) peak of graphite after MA was observed to be located at lower angle than that before MA. The color of the MA sample was found to become gold. These results revealed that Li atoms were intercalated into graphite layers. Neutron diffraction was carried out to get information of the short range structure around a Li atom. The coordination number of the C-Li correlation for the MA sample with nominal LiC<SUB>2</SUB> composition showed the formation of LiC<SUB>3.1</SUB> intercalation compound, the Li concentration of which is much higher than that of stable LiC<SUB>6</SUB> intercalation compound.
粉体および粉末冶金 44(7), 706-711, 1997-07-15
Japan Society of Powder and Powder Metallurgy