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Standard Electrode Potentials03:02

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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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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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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Cathode-Electrolyte Interface Modification by Binder Engineering for High-Performance Aqueous Zinc-Ion Batteries.

Haobo Dong1,2, Ruirui Liu3, Xueying Hu1

  • 1Christopher Ingold Laboratory, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

A novel hybrid binder enhances aqueous zinc-ion batteries (AZIBs) by creating a protective cathode-electrolyte interface (CEI). This improves capacity and cycling stability, offering a cost-effective alternative to traditional binders.

Keywords:
in situ formationinterface engineeringwater-soluble binderzinc-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • A stable cathode-electrolyte interface (CEI) is critical for aqueous zinc-ion batteries (AZIBs).
  • The suitability of commercial binders like poly(vinylidene fluoride) (PVDF) for AZIBs and their CEI is often overlooked.
  • Developing effective CEI strategies is essential for advancing AZIB technology.

Purpose of the Study:

  • To develop a novel water-soluble hybrid binder for AZIBs.
  • To investigate the in situ formation of a protective CEI layer and its impact on interfacial morphology and performance.
  • To explore the mechanism behind the hybrid binder's effectiveness in enhancing charge storage kinetics and battery performance.

Main Methods:

  • Synthesis of a hybrid binder combining sodium alginate (SA) and polytetrafluoroethylene (PTFE).
  • Fabrication of zinc-birnessite MnO2 batteries using the hybrid binder and conventional PVDF binder for comparison.
  • Electrochemical characterization including cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy.
  • In-situ interfacial analysis to understand the CEI formation and properties.

Main Results:

  • The hybrid binder facilitated the in situ formation of a CEI, optimizing interfacial morphology.
  • The hybrid binder shifted charge storage from diffusion-controlled to capacitance-controlled processes.
  • Batteries with the hybrid binder showed a 45.6% higher specific capacity and 99.1% capacity retention over 1000 cycles compared to PVDF.
  • Reduced interface activation energy led to superior rate capability.

Conclusions:

  • The SA/PTFE hybrid binder effectively stabilizes the CEI in AZIBs, enhancing electrochemical performance.
  • The hybrid binder's mechanism involves anionic polyelectrolyte behavior from SA and hydrophobicity from PTFE, facilitating Zn2+ adsorption and reducing desolvation penalties.
  • This hybrid binder presents a cost-effective and universal strategy for modifying interfaces and improving AZIBs.