Oxygen Defects in β-MnO₂ Enabling High-Performance Rechargeable Aqueous Zinc/Manganese Dioxide Battery.

ABSTRACT: Rechargeable aqueous Zn/manganese dioxide (Zn/MnO₂) batteries are attractive energy storage technology owing to their merits of low cost, high safety, and environmental friendliness. However, the β-MnO₂ cathode is still plagued by the sluggish ion insertion kinetics due to the relatively narrow tunneled pathway. Furthermore, the energy storage mechanism is under debate as well. Here, β-MnO₂ cathode with enhanced ion insertion kinetics is introduced by the efficient oxygen defect engineering strategy. Density functional theory computations show that the β-MnO₂ host structure is more likely for H⁺ insertion rather than Zn²⁺, and the introduction of oxygen defects will facilitate the insertion of H⁺ into β-MnO_2<

SUBMITTER: Han M 

PROVIDER: S-EPMC6957857 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature