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Processes at Electrodes

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...

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$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

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Interconnected mesoporous V₂O₅ electrode: impact on lithium ion insertion rate.

Eleanor I Gillette¹, Nam Kim¹, Gary W Rubloff²

¹Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA. slee@umd.edu.

Physical Chemistry Chemical Physics : PCCP

|October 28, 2016

Summary

We developed novel nanotube array electrodes with porous interconnections for improved lithium-ion battery performance. These structures enhance ion diffusion and capacity retention at high rates, outperforming aligned nanotubes.

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

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Published on: November 11, 2013

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Developing advanced electrode architectures is crucial for enhancing electrochemical device performance.
Nanotube array electrodes offer high surface area but can suffer from limited ion transport.
Controlling mesoscale structural features is key to optimizing electrode kinetics.

Purpose of the Study:

To introduce a novel strategy for creating nanotube array electrodes with periodic porous interconnections.
To investigate the influence of these mesoscale structures on electrochemical properties.
To understand the underlying mechanisms for improved rate performance.

Main Methods:

Utilizing anodized aluminum oxide (AAO) growth modification and atomic layer deposition (ALD).
Fabricating electrodes with controlled porous interconnections between nanotubes.
Employing charge deconvolution methods to analyze electrochemical kinetics.

Main Results:

The porous interconnected nanotube arrays demonstrated significantly improved Li+ ion insertion kinetics.
Electrodes exhibited superior capacity retention at high rates compared to aligned nanotube counterparts.
The study identified electronic effects within the electrodes as the origin of improved rate performance.

Conclusions:

The developed strategy successfully creates nanotube array electrodes with enhanced electrochemical performance.
Porous interconnections are critical for improving ion diffusion and rate capability in battery electrodes.
Mesoscale structural engineering, particularly electronic effects, plays a vital role in optimizing electrode kinetics.