Unlocking Ultrafast-Kinetics Asymmetric Heterojunction with Multi-Anionic Redox Chemistry Enables High Energy/Power...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Zinc-ion batteries (ZIBs) face challenges in performance due to sluggish kinetics and limited redox activity in traditional vanadium-based cathodes.
• Developing advanced cathode materials is crucial for overcoming these limitations and enabling high-performance ZIBs.

Purpose of the Study:

• To engineer a novel triple-phase heterojunction cathode for ZIBs using a thermal oxidation phase-engineering strategy.
• To enhance reaction kinetics, redox activity, and low-temperature performance of vanadium-based cathodes.

Main Methods:

• A thermal oxidation phase-engineering strategy was employed to create a VSSe core with VO2 and V2O5 interfaces.
• The resulting triple-phase heterojunction cathode was characterized for its structural, electrochemical, and performance properties.

Main Results:

• The engineered cathode exhibited a high reversible capacity of 432 mAh g-1 at 1 A g-1.
• It demonstrated remarkable capacity retention of 80% after 14,000 cycles at 30 A g-1, even at -10 °C.
• The heterojunction structure facilitated synergistic multi-anionic/cationic redox activity and efficient charge transfer.

Conclusions:

• The triple-phase heterojunction cathode design overcomes intrinsic limitations of single-phase materials, offering superior capacity and stability.
• This approach provides a new paradigm for designing advanced electrodes for next-generation energy storage systems, particularly for low-temperature applications.