Nuclear chemistry

Battery (electricity)

Quantum mechanics

Calcination

Catalysis

Engineering

Electrochemistry

Metallurgy

Materials science

Cathode

Power (physics)

Ammonia

Molecule

Inorganic chemistry

Chemical engineering

Vanadium

Hydrothermal synthesis

Faraday efficiency

Zinc

Physical chemistry

Physics

Organic chemistry

Hydrothermal circulation

Sodium-ion battery

Energy storage

Aqueous solution

Crystallography

Chemistry

Electrode

Journal of Alloys and Compounds

Vanadium-based materials with high capacity and stability are needed to promote aqueous zinc ion batteries in large-scale energy storage. NH3 modified β-Na0.33V2O5 is prepared by a facile hydrothermal method and subsequent calcination. The NH3 modification mechanism of β-Na0.33V2O5 is proposed, which includes forming vacancies, structural defects and V-O-N bonds after escaping most ammonia molecules from β-Na0.33V2O5's framework, and retaining a small part of ammonia molecules in its structure. In the Zn/β-Na0.33V2O5 battery system, the β-Na0.33V2O5 delivers a high capacity of 430 mAh g−1 at 200 mA g−1 and good structural stability. After 50th cycles at 200 mA g−1, the β-Na0.33V2O5 modified by NH3 under N2 atmosphere possesses a lower Warburg coefficient of 19.90 Ωcm2s−0.5 than 29.3 Ωcm2s−0.5 of β-Na0.33V2O5 without modification. The rigid β-Na0.33V2O5 is opened by small NH3 molecules, which provides new horizons for optimizing tunneled vanadium-based materials for aqueous zinc ion batteries.

NH3 modified β-Na0.33V2O5 with high capacity for aqueous zinc ion battery cathode