Enhanced metastability of high-density Li intercalation in boron-doped graphite

High-pressure reaction of Li metal and graphite yields LiC 2, three times as dense in Li as the usual LiC 6. LiC 6 decomposes rapidly but incompletely into LiC 6 + Li upon releasing pressure. A dramatic enhancement is observed in the metastability of the high Li density when the graphite contains 0....

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Bibliographic Details
Published in:Solid state communications 1996-02, Vol.97 (7), p.583-585
Main Authors: Nalimova, Vera A, Bindra, Chetna, Fischer, John E
Format: Article
Language:English
Subjects:
B. chemical synthesis
C. high pressure
D. crystal structure
X-ray diffraction
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Summary:High-pressure reaction of Li metal and graphite yields LiC 2, three times as dense in Li as the usual LiC 6. LiC 6 decomposes rapidly but incompletely into LiC 6 + Li upon releasing pressure. A dramatic enhancement is observed in the metastability of the high Li density when the graphite contains 0.5 at.% substitutional boron. Average compositions from X-ray (OOL) intensities, determined several months after releasing the pressure, are LiC 2.2 and LiC 3.8 with and without boron respectively. The Li “layer” is split along c by 0.5 Å suggesting a puckering which reduces the repulsive interactions.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(95)00718-0