Fig. 4: Li crystallization at engineered Li–SE interfaces.

a The Li–SE interface model with nanoclusters or dopants. Atomistic structures of the Li–SE interface with b HCP-Li nanoclusters and c Na dopants (dark blue), and d the atomistic energies of different Li types within the 7.0 Å-thick layer (2nd to 5th layers) shown in Li DOAS. e The energy of Li metal referenced to bulk crystalline Li per area (Source data are provided as a Source Data file) and f–h the number of Li atoms with different local configurations in the Li metal, during the Li insertion with pristine Li–SE interface (red), interface with Na dopants (orange), and interface with HCP-Li nanoclusters (blue).