Herein, we report on the elaborate synthesis of a novel hybrid architecture, i.e., black tin oxide-black titanium oxide core-shell nanotubes (denoted as TiO2-x@SnO2-x nanotubes) by NaBH4 co-reduction. The synergistic interplay between the SnO2-x core and the TiO2-x shell results in superior cyclability and rate capability for ultrastable and fast lithium storage.