Abstract
A Thomas-Fermi density-functional theory is developed for structural energies in stage-one alkali-graphite intercalation compounds. Correct trends for lattice constants and elastic moduli are obtained. We compute corrugation energies $\ensuremath{\Delta}E$ and alkali-alkali spring constants $k$, which determine in-plane intercalant diffusion and domain-wall structure. $k$ is determined by electrostatic effects, and is mainly independent of intercalant. $\ensuremath{\Delta}E$ depends strongly on intercalant size; thus Li differs substantially from K, Rb, and Cs.
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