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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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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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N-methyl Formamide Electrolyte Additive Enabling Highly Reversible Zn Anodes.

Peter Joseph Chimtali1, Xiya Yang1, Quan Zhou1

  • 1National Synchrotron Radiation Laboratory, Key Laboratory of Precision and Intelligent Chemistry, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230029, P. R. China.

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

N-methyl formamide (NMF) additive improves aqueous zinc batteries by preventing side reactions and dendrites. This enhances cycling life and reversibility for better battery performance.

Keywords:
DFT calculationsN‐methyl formamideadvanced synchrotron radiation spectroscopyelectrolytesolvation structurezinc ion battery

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous zinc ion batteries face challenges like parasitic side reactions and dendrite formation, limiting their practical application due to poor cycling life and low reversibility.
  • These issues stem from uncontrolled zinc deposition and electrolyte decomposition during battery operation.

Purpose of the Study:

  • To investigate the efficacy of N-methyl formamide (NMF) as a multifunctional electrolyte additive for enhancing the performance of aqueous zinc ion batteries.
  • To elucidate the mechanism by which NMF suppresses parasitic reactions and dendrite formation.

Main Methods:

  • Advanced synchrotron radiation spectroscopy was employed to analyze the interfacial chemistry and solvation structure.
  • Density Functional Theory (DFT) calculations were utilized to understand the interaction between NMF, Zn2+ ions, and the electrode surface.
  • Electrochemical testing, including symmetric cell cycling and full cell performance evaluation (Zn||PANI), was conducted.

Main Results:

  • NMF additive effectively modifies the Zn2+ solvation structure, promoting uniform zinc deposition.
  • The additive successfully suppresses parasitic side reactions and inhibits dendrite formation on the zinc anode.
  • An ultralong cycling life of 3115 hours was achieved in a Zn||Zn symmetric cell at 0.5 mA cm-2.
  • The Zn||PANI full cell with NMF electrolyte demonstrated superior rate and cycling performance compared to a pristine ZnSO4 electrolyte.

Conclusions:

  • N-methyl formamide is a highly effective additive for improving the stability and performance of aqueous zinc ion batteries.
  • The study provides valuable insights into electrolyte engineering for high-performance aqueous metal batteries.
  • This approach offers a promising strategy for developing safer and more durable energy storage solutions.