Innovative 2D dioxonium vanadium oxide: enhancing stability in aqueous zinc-ion battery cathodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Vanadium oxides are promising cathode materials for aqueous zinc-ion batteries.
• Developing stable and high-performance cathode materials is crucial for advancing battery technology.

Purpose of the Study:

• To synthesize a novel vanadium oxide compound for aqueous Zn-ion batteries.
• To investigate the electrochemical performance and structural stability of the synthesized material.

Main Methods:

• Hydrothermal synthesis of V3O8(H3O)2 nanoplatelets.
• Material characterization using various techniques.
• Electrochemical testing in coin cells with different electrolytes.
• Post-mortem analysis and DFT calculations.

Main Results:

• Layered V3O8(H3O)2 nanoplatelets with tetragonal structure were successfully synthesized.
• The material exhibited high reversibility and cycling stability in Zn(CF3SO3)2 electrolyte.
• A specific capacity of 150 mA h g-1 at 100 mA g-1 and near 100% coulombic efficiency were achieved.
• Reversible structural transformation between nanoplatelets and nanoflakes was observed.

Conclusions:

• The synthesized V3O8(H3O)2 is a highly reversible cathode material for aqueous zinc-ion batteries.
• The material shows excellent cycling stability and potential for practical applications.
• DFT calculations provide mechanistic insights into Zn2+ ion storage.