Facet-dependent lithium intercalation into Si crystals: Si(100)vs.Si(111)
Literature Information
Sung Chul Jung, Young-Kyu Han
Fast Li transport in battery electrodes is essential to meeting the demanding requirements for a high-rate capability anode. We studied the intercalation of a Li atom into the surface and subsurface layers of Si(100) and Si(111) using density functional calculations with a slab representation of the surfaces. We suggest that the Li atom migrates on the Si surfaces and is subsequently inserted into the inside for both Si(100) and Si(111). The rate-determining steps are the surface incorporation and subsurface diffusion in Si(100) and Si(111), respectively. Our diffusion rate calculations reveal that, once the Li atom is incorporated into the Si surface, Li diffuses faster by at least two orders of magnitude along the 〈100〉 direction than along the 〈111〉 direction. The importance of careful treatment of the slab thickness for the study of impurity insertion into subsurface layers is also stressed.
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