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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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Stable zinc anode solid electrolyte interphase via inner Helmholtz plane engineering.

Jinrong Luo1,2, Liang Xu3, Yinan Yang1

  • 1School of Materials Science and Engineering, Peking University, 100871, Beijing, P. R. China.

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Introducing beta-cyclodextrins (β-CD) into zinc electrolytes optimizes the solid-electrolyte interphase (SEI) for stable zinc-ion batteries (ZIBs). This modification effectively suppresses dendrite growth and enhances battery longevity.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • The solid-electrolyte interphase (SEI) is critical for the electrochemical stability of zinc-ion batteries (ZIBs).
  • Optimizing the inner Helmholtz plane is key to controlling SEI formation and improving ZIB performance.

Purpose of the Study:

  • To investigate the effect of β-cyclodextrins (β-CD) as anion receptors in aqueous electrolytes for ZIBs.
  • To demonstrate how β-CD can optimize the Zn anode SEI structure for enhanced stability.

Main Methods:

  • Incorporation of β-cyclodextrins (CD) into Zn(OTf)2 aqueous electrolytes.
  • Analysis of the inner Helmholtz plane and SEI structure using electrochemical methods.
  • Fabrication and testing of Zn|Zn pouch cells with modified electrolytes.

Main Results:

  • β-CD forms a β-CD@OTf- dominated inner Helmholtz structure by encapsulating OTf- anions.
  • Electrochemical decomposition of β-CD@OTf- in situ forms a hybrid organic-inorganic SEI (ZnF2/ZnCO3/ZnS-(C-O-C/*CF/*CF3)).
  • The optimized SEI effectively hinders zinc dendrite growth and maintains mechanical stability, leading to long-term ZIB performance.

Conclusions:

  • β-cyclodextrins are effective electrolyte additives for regulating SEI structure in ZIBs.
  • The developed strategy significantly improves the electrochemical stability and lifespan of ZIBs.
  • This work provides insights into designing advanced electrolytes for stable zinc-ion batteries.