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Ladder Diagrams: Redox Equilibria01:30

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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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Related Experiment Video

Updated: Jun 1, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Local Structure Regulation for Oxygen Redox and Structure Stability of P2-Type Cathodes.

Dongxiao Wang1, Feihu Zou1, Xingguo Qi2

  • 1Materials Genome Institute, Shanghai University, Shanghai, 200444, China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 17, 2025
PubMed
Summary

Local structure tuning in layered oxide cathodes enhances sodium-ion battery capacity. Inter-layer stacking modifications improve structural stability and anionic redox kinetics for better battery performance.

Keywords:
P2‐type cathodesanionic redoxlocal structure regulationreductive couplingsodium‐ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Local structure is key for oxygen redox reactions in layered oxide cathodes for sodium-ion batteries.
  • Research has focused on intra-layer ordering, with limited exploration of inter-layer stacking effects.

Purpose of the Study:

  • To investigate the impact of intra-layer and inter-layer local structural regulation on anionic kinetics and structural stability.
  • To explore novel strategies for enhancing sodium-ion battery cathode performance.

Main Methods:

  • Experimental analysis and theoretical calculations were employed.
  • Cu2+ substitution was used to modify the inter-layer transition metal structure of P2-Na0.67Mg0.28Mn0.72O2.
  • A zig-zag stacked honeycomb superlattice structure was achieved in P2-Na0.67Cu0.14Mg0.14Mn0.72O2.

Main Results:

  • Local structure regulation mitigated cation migration and improved structural reversibility, even at deep desodiation (Na0.05).
  • Reductive coupling between cationic and anionic redox processes facilitated electron transfer from oxygen to copper ions.
  • Electrochemical kinetics and hysteresis were governed by these redox coupling effects.

Conclusions:

  • The study demonstrates an optional pathway for enhancing structural stability and oxygen redox chemistry dynamics in P2-type cathode materials.
  • A full cell with a hard carbon anode exhibited good energy density at high power density.
  • Inter-layer structural regulation is a promising strategy for advanced sodium-ion battery cathodes.