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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

14
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

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The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect.
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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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Ultrafast lithium diffusion in bilayer graphene.

Matthias Kühne1, Federico Paolucci1,2, Jelena Popovic1

  • 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.

Nature Nanotechnology
|June 6, 2017
PubMed
Summary
This summary is machine-generated.

Bilayer graphene acts as a single-phase mixed conductor, enabling faster lithium-ion diffusion than graphite. This discovery offers a promising new material for advanced battery electrodes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Physics

Background:

  • Simultaneous electron and ion conduction is crucial for battery electrodes.
  • Single-phase materials with high ionic and electronic conductivity are rare.
  • Multiphase systems with separate ion/electron channels are current alternatives.

Purpose of the Study:

  • To investigate bilayer graphene as a single-phase mixed conductor.
  • To measure lithium-ion diffusion kinetics in bilayer graphene.
  • To explore its potential for battery applications.

Main Methods:

  • Developed an on-chip electrochemical cell architecture for localized lithium intercalation.
  • Utilized time-dependent Hall measurements with spatially displaced probes.
  • Monitored in-plane lithium diffusion kinetics within the graphene bilayer.

Main Results:

  • Bilayer graphene exhibits faster lithium diffusion than graphite.
  • Lithium diffusion in bilayer graphene surpasses that of sodium chloride in water.
  • A diffusion coefficient as high as 7 × 10⁻⁵ cm² s⁻¹ was measured.

Conclusions:

  • Bilayer graphene is a novel single-phase mixed conductor.
  • Its high ionic conductivity makes it a promising material for battery electrodes.
  • This research opens new avenues for designing efficient energy storage materials.