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In this communication, we successfully synthesized a new SnO₂ nanoarchitecture: extremely thin sheets, with minimum thicknesses of 1.5−3.0 nm. The products were prepared through a facile hydrothermal treatment using tin dichloride as the precursor. Planar or scrolled SnO₂ sheets were carefully examined by transmission electron microscopy. The assemblies of these sheets have a high BET surface area of 180.3 m²/g and extraordinarily large pore volume of 1.028 cm³/g. They also exhibit a high lithium storage capacity and excellent cyclability due to its nanometer-sized frame and breathable characteristic.