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In Situ Construction of a Hydrophobic Honeycomb-like Structured ZnMoO4 Coating Applied for Enhancing Zinc Anode
Wenjing Dai1, Hong Yun1, Miaoqiang Lyu2
1Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Hydrophobic ZnMoO4 coatings on zinc anodes prevent corrosion and side reactions in aqueous zinc-ion batteries (AZIBs). This enhances cycle life, demonstrating a stable and effective solution for advanced battery technology.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous zinc-ion batteries (AZIBs) face challenges with zinc anode degradation, including interfacial side reactions and corrosion.
- These issues significantly limit the cycling stability and overall lifespan of AZIB devices.
Purpose of the Study:
- To develop a protective coating for zinc anodes to mitigate degradation in AZIBs.
- To enhance the cycling performance and long-term stability of aqueous zinc-ion batteries.
Main Methods:
- Fabrication of hydrophobic Zinc Molybdate (ZnMoO4) coatings on zinc anodes using in situ liquid phase deposition.
- Characterization of the ZnMoO4 coating's structure, hydrophobicity (contact angle = 128°), and protective capabilities.
- Evaluation of Zn@ZMO symmetrical cells and Zn@ZMO//V2O5 full cells for cycling stability and capacity retention.
Main Results:
- The hydrophobic ZnMoO4 coating demonstrated excellent corrosion protection for the zinc anode over 30 days of immersion.
- The honeycomb-like structure of the coating facilitated Zn2+ ion diffusion and ion transport, especially under high current cycling.
- Zn@ZMO symmetrical cells achieved over 2700 hours of stable cycling, a >100-fold improvement over bare zinc.
- The Zn@ZMO//V2O5 cell maintained 88% capacity after 500 cycles at 5 A g-1, showing remarkable long-term stability.
Conclusions:
- The hydrophobic ZnMoO4 coating effectively protects the zinc anode from corrosion and side reactions in AZIBs.
- The unique microchannel structure enhances ion transport, leading to superior cycling performance.
- This approach offers a promising strategy for developing stable and long-lasting aqueous zinc-ion batteries.
