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Related Concept Videos

Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
Redox Equilibria: Overview01:23

Redox Equilibria: Overview

A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
Balancing Redox Equations02:58

Balancing Redox Equations

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...
Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...

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Related Experiment Video

Updated: May 9, 2026

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
09:49

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery

Published on: February 13, 2017

Reversible anionic redox chemistry in high-capacity layered-oxide electrodes.

M Sathiya1, G Rousse, K Ramesha

  • 11] LRCS, CNRS UMR 7314, Université de Picardie Jules Verne, 80039 Amiens, France [2] ALISTORE-European Research Institute, FR CNRS 3104, France.

Nature Materials
|July 16, 2013
PubMed
Summary

New lithium-ion battery materials, Li₂Ru(1-y)Sn(y)O₃, achieve high capacities through novel cationic and anionic redox processes. This discovery opens avenues for advanced energy storage solutions.

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

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Last Updated: May 9, 2026

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
09:49

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery

Published on: February 13, 2017

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
10:03

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Classical lithium-ion battery positive electrodes rely on insertion-deinsertion redox mechanisms.
  • Li-rich layered oxides exhibit high capacities but possess complex structures and compositions.
  • Existing mechanisms are insufficient to explain the high performance of advanced Li-ion materials.

Purpose of the Study:

  • To design and investigate novel Li-ion battery materials with enhanced capacity.
  • To elucidate the redox mechanisms responsible for high reversible capacities in new materials.
  • To explore the potential of Li₂MO₃ compounds for next-generation energy storage.

Main Methods:

  • Synthesis of structurally related Li₂Ru(1-y)Sn(y)O₃ materials.
  • Electrochemical characterization to assess reversible capacities and cycling behavior.
  • Multiple characterization techniques to unambiguously determine the redox processes involved.

Main Results:

  • Li₂Ru(1-y)Sn(y)O₃ materials exhibit sustainable reversible capacities up to 230 mA h g⁻¹.
  • These materials demonstrate good cycling stability with minimal voltage decay and irreversible capacity.
  • Reactivity involves cumulative cationic (M(n+)→M((n+1)+)) and anionic (O(2-)→O₂(2-)) redox processes.

Conclusions:

  • The novel redox mechanism, involving d-sp hybridization and reductive coupling, explains the high capacity.
  • Li₂MO₃ compounds represent a vast family with significant potential for high-capacity battery materials.
  • This research paves the way for developing advanced materials for electric transportation and portable electronics.