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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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Sulfurized Composite Interphase Enables a Highly Reversible Zn Anode.

Lu Wu1, Hao Yuan2, Yongkang An1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.

Angewandte Chemie (International Ed. in English)
|November 12, 2024
PubMed
Summary

This study reveals how sulfate (-SO3) and zinc sulfide (ZnS) in zinc sulfate electrolytes improve zinc anode stability. This breakthrough enhances zinc-ion battery performance and lifespan.

Keywords:
anionic synergisticelectrolytein situ sulfurized SEIzinc ion batteries

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • The stability of zinc anodes is crucial for rechargeable zinc-ion batteries.
  • Solid electrolyte interphase (SEI) formation is key to improving zinc anode performance.
  • The role of specific components like sulfate (-SO3) in SEI formation has been underexplored.

Purpose of the Study:

  • To investigate the overlooked role of -SO3 and ZnS in the in situ formed sulfide composite SEI (SCSEI) on zinc anodes.
  • To elucidate the synergistic effects of -SO3 and ZnS on zinc anode electrochemistry in ZnSO4 aqueous electrolytes.
  • To enhance the practical application of zinc-ion batteries through a novel anionic synergistic strategy.

Main Methods:

  • In situ construction of SEI on Zn surface using ZnSO4 electrolyte.
  • Structure characterization techniques.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • The introduction of -SO3 reduces dehydration energy of [Zn(H2O)6]2+ and enhances ZnS/Zn interface stability.
  • -SO3 homogenizes the electric field at the ZnS/Zn interface, improving Zn2+ deposition kinetics and uniformity.
  • A symmetrical cell achieved 1500 hours of cycling stability with a cumulative-plated capacity of 7.5 Ah cm-2 at 10 mA cm-2.
  • A full cell with NH4V4O10 cathode exceeded 2000 cycles at 5 Ag-1 with 100% Coulombic efficiency.

Conclusions:

  • The synergistic effect of ZnS and -SO3 in the SCSEI significantly improves zinc anode stability and reversibility.
  • This anionic synergistic strategy offers a promising pathway for developing high-performance and long-lasting zinc-ion batteries.
  • The findings provide new insights into the electrochemical behavior of zinc anodes in aqueous electrolytes.