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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Updated: Nov 1, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Suppressing Redox Shuttle with MXene-Modified Separators for Li-O2 Batteries.

Lei Shi1,2, Zheng Li1,2, Yanpei Li1,2

  • 1CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, P. R. China.

ACS Applied Materials & Interfaces
|June 24, 2021
PubMed
Summary

This study introduces a MXene-modified separator to prevent shuttle effects in lithium-oxygen (Li-O2) batteries. This innovation significantly improves battery stability and lifespan by suppressing redox mediator migration.

Keywords:
Li−O2 batteriesMXenechemical bindingredox mediatorseparator modificationshuttle effect

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Soluble redox mediators (RMs) in Li-O2 batteries reduce charge polarization but cause shuttle effects.
  • Shuttle effects lead to performance degradation and anode corrosion in Li-O2 batteries.

Purpose of the Study:

  • To develop a strategy to suppress the shuttle effect of triiodide ions (I3-) in LiI-involved Li-O2 batteries.
  • To enhance the stability and cycle life of Li-O2 batteries using a modified separator.

Main Methods:

  • A MXene-modified separator with a 3D porous hierarchical structure was designed.
  • Chemical binding strategy utilizing MXene's -OH terminal groups to trap I3-.
  • Experimental characterizations and theoretical calculations were employed.

Main Results:

  • The MXene-modified separator effectively suppressed the migration of I3-.
  • The 3D porous structure facilitated fast lithium-ion transfer.
  • Li-O2 batteries with the modified separator showed no redox shuttling and a 3x longer cycle life (100 cycles).

Conclusions:

  • MXene-modified separators are a viable strategy to mitigate shuttle effects in Li-O2 batteries.
  • This approach enhances battery performance and longevity.
  • The study provides insights for developing advanced separators for redox mediator-enhanced Li-O2 batteries.