Self-assembled nanoporous rutile TiO2 mesocrystals with tunable morphologies for high rate lithium-ion batteries

► Wulff-shaped and nanorod-like mesocrystals form from ultrathin rutile TiO2 nanowires. ► TiO2 mesocrystals are promising anode material for high-power lithium-ion batteries. ► Large reversible charge-discharge capacity and excellent cycling stability. ► Enhanced properties from nanoporosity, large surface area and sufficient void space.