The Organic Ligand Etching Method for Constructing In Situ Terraced Protective Layer Toward Stable Aqueous Zn Anode.
Li Li1, Hang Yang1, Zeyu Yuan1
1College of Physics, College of Chemistry, the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, International Center of Future Science, Jilin University, Changchun, Jilin, 130012, China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 27, 2023
Summary
An organic ligand etching method creates a protective layer on zinc anodes, improving aqueous Zn-ion battery stability. This enhances zinc deposition and inhibits dendrite growth for longer battery life.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous Zn-ion batteries (AZIBs) stability is crucial for practical applications.
- The reversibility of zinc anode stripping/plating significantly impacts AZIB performance.
- Developing effective protective layers for Zn anodes is essential to overcome stability challenges.
Purpose of the Study:
- To develop an in situ multifunctional protective layer on Zn anodes using an organic ligand etching method.
- To investigate the impact of the protective layer on Zn deposition kinetics and dendrite inhibition.
- To enhance the long-term stability and cycling performance of AZIBs.
Main Methods:
- Utilizing a 0.02 M [Fe(CN)6]3- organic ligand etching solution for Zn anode surface modification.
- Characterizing the in situ protective layer's structure and composition.
- Evaluating the electrochemical performance of the modified Zn anode in AZIBs, including Coulombic efficiency and long-term cycling stability.
- Investigating the effect of metal cation additives (Ni2+, Mn2+, Cu2+) on interface layer formation and Zn deposition.
Main Results:
- The etching process created a unique terraced protective layer on the Zn anode, blocking direct electrode-electrolyte contact.
- The protective layer, containing C, N, Zn, and Fe, demonstrated strong zincophilicity, promoting Zn2+ deposition kinetics and 3D nucleation.
- The modified Zn anode achieved a high Coulombic efficiency of 99.6% over 1000 cycles.
- The etched Zn anode exhibited over 400 hours of long-term stability at a high current density of 10 mA cm-2.
- Metal cation additives accelerated the synthesis of 3D artificial interface layers and regulated Zn deposition.
Conclusions:
- The organic ligand etching method provides an effective strategy for developing in situ protective layers on Zn anodes for AZIBs.
- The unique terraced structure and zincophilic nature of the protective layer significantly enhance Zn anode reversibility and suppress dendrite growth.
- This approach offers a new perspective for surface modification of Zn metal anodes, improving battery performance and longevity.
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