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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

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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 battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Nonstandard Reaction Conditions
The interconnection between standard cell potentials and various thermodynamic parameters such as the standard free energy change ΔG° and equilibrium constant K has been previously explored. For example, a redox reaction involving zinc(II) and tin(II) ions at 1 M concentration with Eºcell = +0.291 V and ΔG° = −56.2 kJ is spontaneous.
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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Electrolytes for Zn Batteries: Deep Eutectic Solvents in Polymer Gels.

Victor Gregorio1,2, Piotr Jankowski2,3, Nuria Garcia1

  • 1Instituto de Ciencia y Tecnología de Polímeros Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Calle Juan de la Cierva 3, 28006, Madrid, Spain.

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|March 14, 2023
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New gel polymer electrolytes using deep eutectic solvents and poly(ethylene oxide) show high ionic conductivity and reduced dendritic growth, offering promising advancements for battery technology.

Keywords:
deep eutectic solventsgel electrolytespolymerszinc batteries

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Polymer Science

Background:

  • Deep eutectic solvents (DES) offer unique properties for electrolytes.
  • Poly(ethylene oxide) (PEO) is a common polymer used in solid-state electrolytes.
  • Developing stable and conductive gel polymer electrolytes is crucial for advanced batteries.

Purpose of the Study:

  • To prepare and characterize novel gel polymer electrolytes based on acetamide:Zn(TFSI)2 DES and PEO.
  • To investigate the influence of PEO molecular weight and concentration on electrolyte properties.
  • To evaluate the electrochemical performance, including ionic conductivity and dendritic growth suppression.

Main Methods:

  • Solvent-free synthesis of gel polymer electrolytes.
  • Physicochemical characterization (e.g., pseudo-solid behavior).
  • Electrochemical impedance spectroscopy for ionic conductivity measurements.
  • Dendrite growth studies in soft gels.
  • Chemical structure analysis using spectroscopic techniques.

Main Results:

  • Gel electrolytes with ultrahigh molecular-weight PEO exhibit pseudo-solid behavior and high ionic conductivity.
  • Reduced dendritic growth was observed in gels with up to 1 wt% PEO.
  • Strong interactions between PEO and Zn2+ ions were confirmed.
  • Addition of PEO can lead to blend crystallization, but maintaining the eutectic point is possible by adjusting acetamide content.

Conclusions:

  • Gel polymer electrolytes based on acetamide:Zn(TFSI)2 DES and PEO can be efficiently prepared.
  • Ultrahigh molecular-weight PEO enhances ionic conductivity and suppresses dendrite formation.
  • Careful control of composition is necessary to balance gel properties and maintain electrolyte stability.