Abstract
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.
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