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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Related Experiment Video

Updated: Jun 12, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Operando electron spin probes for the study of battery processes.

H Nguyen1, E N Bassey1, E E Foley1

  • 1Materials Department, University of California, Santa Barbara, CA 93106, USA; Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 21, 2024
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Summary

We developed new operando electrochemical cells using magnetometry and electron paramagnetic resonance (EPR) to study battery materials. These tools reveal real-time redox processes in both intercalation and conversion electrodes for advanced energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Analytical Chemistry

Background:

  • Operando techniques offer real-time insights into battery material behavior.
  • Standard characterization methods struggle with complex electrode chemistries.

Purpose of the Study:

  • To design and develop operando magnetometry and electron paramagnetic resonance (EPR) electrochemical cells.
  • To demonstrate the utility of these cells for studying intercalation and conversion electrodes.

Main Methods:

  • Development of specialized electrochemical cells with clamping mechanisms for sufficient compression.
  • Simultaneous application of operando magnetometry and EPR spectroscopy.
  • Analysis of electrochemical performance and material transformations during battery cycling.

Main Results:

  • Identified five distinct redox processes in LiNi0.5Mn0.5O2 intercalation cathodes.
  • Tracked Fe nanoparticle formation and reversibility in Na3FeF6 conversion electrodes.
  • Demonstrated the need for sufficient cell compression for optimal electrochemical performance.

Conclusions:

  • Operando magnetometry and EPR cells provide crucial real-time data for battery research.
  • These tools are broadly applicable to diverse electrode materials and structures.
  • The developed methods promise advancements in electrochemical energy storage technologies.