Ternaryintercalationcompounds,C,F(AlF,),andC,F(MgF,),containingactivefluorineatoms adsorbed on carbon Iavers of host tzraohite were used as a cathode material of lithium cell. The discharge potentials are 2.8-2.5 v at current densities 40400 PA cm-', being higher than that for graphite fluoride belo
Graphite intercalation compound of magnesium fluoride and fluorine
โ Scribed by T. Nakajima; M. Kawaguchi; N. Watanabe
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 501 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0008-6223
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โฆ Synopsis
A graphite intercalation compound of C,F(MgF& was prepared under a fluorine atmosphere of 1 atm at temperatures of 20-350ยฐC. The 1st stage compound has the identity period of 9.3-9.4& ESCA and @F NMR spectra indicate that the chemical interaction of intercalated fluorine with carbon is similar to that for graphite fluoride, however, with &F(MgF& having slightly mobile fluorine atoms chemically adsorbed on carbon atoms of graphite layers.
๐ SIMILAR VOLUMES
Fluorine-graphite intercalation compounds have been prepared from HOPG and natural graphite powder in the presence of a fluoride such as AgF, WF,, or SbF, at room temperature. The C,F samples obtained were quasi stage 1, 2, and 3 compounds with compositions of Cz ,F-CU hF. The stage 1 hases in the a
The rate of fluorine intercalation in graphite is larger in the present system than in other metal fluorides examined previously. X-ray diffraction data indicate that C,F belongs to a hexagonal system with a superlattice of a, = 2a, in the ab plane, accompanying some amount of a bi-intercalation pha
The kinetics of intercalation of bromine in graphite were modeled by considering the change in free energy from stage to stage and the diffusion of bromine. The model predicts that Cn,4BrZ is unstable at temperatures above N 250ยฐC. Satisfactory agreement was found between the model and the experimen