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A Dendrite-Free Zn Anode Co-modified with In and ZnF2 for Long-Life Zn-Ion Capacitors
Yang Zhou1, Hao Tong1, Yuan Wu1
1Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing210016, People's Republic of China.
ACS Applied Materials & Interfaces
|October 4, 2022
Summary
Researchers improved aqueous zinc batteries by coating zinc anodes with InF3, In, and ZnF2. This modification enhances cycling stability and prevents dendrite formation, crucial for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Aqueous zinc batteries offer high capacity, low cost, and safety.
- Zinc anode dendrites and corrosion limit coulombic efficiency and cycling stability.
Purpose of the Study:
- To enhance the performance of aqueous zinc batteries.
- To address dendrite formation and corrosion issues in zinc anodes.
Main Methods:
- Decorating zinc foil surfaces with InF3.
- Applying simultaneous In and ZnF2 coatings to the zinc anode.
- Testing symmetrical batteries and zinc-ion capacitors with modified anodes.
Main Results:
- Modified zinc anode maintained low voltage hysteresis (30 mV) after 1400 plating/stripping cycles.
- Zinc-ion capacitor achieved 33.5 Wh kg-1 energy density and 1608 W kg-1 power density.
- Near 100% capacity retention after 10,000 cycles in the capacitor.
Conclusions:
- InF3 decoration and In/ZnF2 coatings effectively improve zinc anode stability.
- The modified anode significantly enhances cycling stability and corrosion resistance in aqueous zinc batteries.
- This approach is promising for the practical application of high-performance aqueous zinc batteries.
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