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Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Tailoring the Electrode Interface Microenvironment to Stabilize Zn Metal Anode.

Weiping Hou1, Yuliang Gao1, Shifeng Huang1

  • 1School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 3, 2024
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Summary

Lanthanum trifluoromethanesulfonate stabilizes zinc anodes in aqueous batteries by optimizing the interface. This strategy suppresses dendrites, enabling long-lasting and stable battery performance.

Keywords:
Zn metal anodedendriteelectrode interface microenvironmentelectrolyte additivepouch cell

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Zinc metal anodes are promising for aqueous batteries due to their high capacity.
  • Dendrite formation remains a critical challenge, hindering battery cycle life and safety.

Purpose of the Study:

  • To stabilize zinc metal anodes in aqueous batteries by controlling the electrode interface microenvironment.
  • To investigate the role of lanthanum trifluoromethanesulfonate (La(OTf)3) in mitigating dendrite growth.

Main Methods:

  • Utilized a lanthanum trifluoromethanesulfonate-based electrolyte.
  • Investigated ion concentration, solid electrolyte interphase (SEI) formation, and electric field distribution.
  • Performed theoretical calculations and experimental validation.

Main Results:

  • La(OTf)3 modified the electrolyte microstructure, enhancing mass transfer and reducing ion concentration gradients.
  • A favorable inorganic-rich SEI layer was formed.
  • Adsorbed La3+ ions homogenized the electric field, promoting uniform zinc deposition.
  • Achieved highly reversible Zn plating/stripping for 7000 cycles (Zn||Cu) and 3600 hours (Zn||Zn).
  • Demonstrated stable cycling (>500 cycles) in NH4V4O10||Zn pouch cells with low gassing.

Conclusions:

  • Tailoring the electrode interface microenvironment with La(OTf)3 effectively stabilizes zinc metal anodes.
  • The proposed method significantly improves the electrochemical performance and cycle life of aqueous zinc batteries.
  • This approach offers a viable strategy for developing high-performance and safe aqueous zinc batteries.