Elaborate synthesis of black tin oxide–black titanium oxide core–shell nanotubes for ultrastable and fast lithium storage

We report on the elaborate synthesis of TiO_2−x@SnO_2−x nanotubes by NaBH₄ co-reduction, in which the synergistic interplay between the SnO_2−x core and the TiO_2−x shell results in superior cyclability and rate capability for ultrastable and fast lithium storage.