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This paper introduces oxygen-deficient black TiO2 with hierarchically ordered porous structure fabricated by a simple hydrogen reduction as a carbon- and binder-free cathode, demonstrating superior energy density and stability. With the high electrical conductivity derived from oxygen vacancies or Ti3+ ions, this unique electrode features micrometer-sized voids with mesoporous walls for the effective accommodation of Li2O2 toroid and for the rapid transport of reaction molecules without the electrode being clogged. In the highly ordered architecture, toroidal Li2O2 particles are guided to form with a regular size and separation, which induces the most of Li2O2 external surface to be directly exposed to the electrolyte. Therefore, large Li2O2 toroids (≈300 nm) grown from solution can be effectively charged by incorporating a soluble catalyst, resulting in a very small polarization (≈0.37 V). Furthermore, disordered nanoshell in black TiO2 is suggested to protect the oxygen-deficient crystalline core, by which oxidation of Ti3+ is kinetically impeded during battery operation, leading to the enhanced electrode stability even in a highly oxidizing environment under high voltage (≈4 V). [ABSTRACT FROM AUTHOR]

It is confirmed that oxygen‐deficient black TiO2 can operate as a stable cathode for Li‐O2 batteries, where the morphology of black TiO2 was modified to be hierarchically porous. This innovative cathode renders the reaction molecules and air (O2) to permeate reversibly, analogous to the function of the human respiratory system, while generating electricity from the reactions of Li and oxygen. This is reported by Seunghoon Nam, Yongjoon Park, Byungwoo Park, and co‐workers in article number 1700814. [ABSTRACT FROM AUTHOR]