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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Polymeric Redox-Active Electrodes for Sodium-Ion Batteries.

Naiara Fernández1,2,3, Paula Sánchez-Fontecoba1,4, Elizabeth Castillo-Martínez1,5

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New redox-active polymer binders were synthesized for sodium-ion batteries. These binders enhance electrode performance and capacity, showing promise for advanced battery applications.

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batterieselectrochemistrypolymersredox chemistrysodium

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polymer binders are essential for stable electrode performance in sodium-ion (Na+) and lithium-ion (Li+) batteries.
  • Effective binders require mechanical and chemical stability, along with strong adhesion to current collectors.

Purpose of the Study:

  • To synthesize novel redox-active polymer binders with Na+ insertion capabilities and adhesive properties.
  • To investigate the electrochemical performance of these terpolymers as Na-ion negative electrodes.

Main Methods:

  • Terpolymers were synthesized by incorporating polyether amine blocks (Jeffamine) into Schiff-base forming units (p-phenylenediamine and terephthalaldehyde).
  • Electrochemical properties were evaluated using Na-ion half cells, including capacity measurements for powder and Cu-supported electrodes.
  • The polymers were also tested as binders for hard carbon anodes.

Main Results:

  • Achieved reversible capacities of 300 mAh g-1 (50 wt% carbon) and 200 mAh g-1 (20 wt% carbon) with a specific polySchiff-polyether terpolymer.
  • Demonstrated improved electrode capacity when using the novel redox-active polymers with hard carbon compared to standard binders like polyvinylidene fluoride.

Conclusions:

  • The synthesized redox-active terpolymers exhibit promising performance as binders for Na-ion battery electrodes.
  • These novel binders offer enhanced adhesion and electrochemical activity, potentially improving overall battery capacity and cycling stability.