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Stabilizing Zn Metal Anode Through Regulation of Zn Ion Transfer and Interfacial Behavior with a Fast Ion Conductor
Na Guo1, Zhi Peng1, Wenjie Huo1
1School of Chemical Engineering, North China University of Science and Technology, Tangshan, 063009, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 25, 2023
Summary
Researchers developed a novel protective layer for aqueous zinc-ion batteries (AZIBs). This NVP@Zn anode enhances zinc deposition kinetics and stability, paving the way for safer, high-performance energy storage.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous zinc-ion batteries (AZIBs) offer eco-friendly, safe, and cost-effective energy storage.
- Key challenges hindering AZIBs include zinc dendrite formation, corrosion, and hydrogen evolution.
Purpose of the Study:
- To develop a protective layer for AZIB anodes to improve performance and stability.
- To investigate the mechanism of the protective layer in regulating zinc deposition and preventing side reactions.
Main Methods:
- Fabrication of a zinc anode decorated with 3D porous sodium vanadium phosphate (Na3V2(PO4)3, NVP@Zn).
- Electrochemical characterization of the NVP@Zn anode and NVP@Zn/MnO2 full cells.
- Theoretical calculations to understand the Zn ion binding energy and migration barriers.
Main Results:
- The NVP@Zn anode effectively reconstructs the electrolyte/anode interface, providing stable channels for zinc ion deposition.
- The NVP protective layer promotes zinc ion desolvation and prevents side reactions due to its nanoporous structure.
- NVP@Zn/MnO2 full cells demonstrated a high specific discharge capacity of 168 mAh g⁻¹ and 74.6% capacity retention after cycling.
Conclusions:
- The NVP@Zn anode strategy significantly enhances zinc deposition kinetics and regulates ion transport.
- The NVP protective layer effectively suppresses undesirable side reactions and improves the overall stability of AZIBs.
- This approach highlights the potential of NVP as a promising material for high-performance AZIB applications.
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