Breathable Carbon-Free Electrode: Black TiO2 with Hierarchically Ordered Porous Structure for Stable Li–O2 Battery

5 years ago

Breathable Carbon-Free Electrode: Black TiO2 with Hierarchically Ordered Porous Structure for Stable Li–O2 Battery

Chunjoong Kim, Byungwoo Park, Seunghoon Nam, Sangheon Lee, Joonhyeon Kang, Yongjoon Park, Sungun Wi, Jinyoung Kim, Seungmin Hyun

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). A carbon-free TiO2−x electrode is introduced as a stable and efficient cathode for Li–O2 batteries. The oxygen deficiency and hierarchical architecture are deliberately incorporated for the reversible formation/decomposition of Li2O2 toroid and for the rapid transport of reaction species, while preventing the electrode from being clogged. Such “breathable carbon-free electrode” exhibits one of the best round-trip efficiencies over 300 cycles.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700814