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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Rapid determination of solid-state diffusion coefficients in Li-based batteries via intermittent current interruption

Yu-Chuan Chien1,2, Haidong Liu1, Ashok S Menon1,3

  • 1Department of Chemistry-Ångström Laboratory, Uppsala University, Box 538, Lägerhyddsvägen 1, 751 21, Uppsala, Sweden.

Nature Communications
|April 21, 2023
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Summary
This summary is machine-generated.

The new intermittent current interruption (ICI) method offers a faster, reliable alternative to galvanostatic intermittent titration (GITT) for measuring lithium-ion diffusion in electrode materials. This technique enables accurate, real-time monitoring of diffusion coefficients during battery operation.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Galvanostatic intermittent titration (GITT) is standard for Li+ diffusion coefficient determination.
  • GITT is often time-consuming and requires complex analysis.
  • Limitations of GITT necessitate alternative methods for electrode material characterization.

Purpose of the Study:

  • Introduce the intermittent current interruption (ICI) method as a superior alternative to GITT.
  • Validate the accuracy and speed of the ICI method.
  • Demonstrate the utility of ICI for operando battery material analysis.

Main Methods:

  • Theoretical validation using Fick's laws to equate ICI and GITT.
  • Experimental comparison of ICI and GITT results on insertion electrode materials.
  • Operando X-ray diffraction coupled with ICI for real-time diffusion monitoring.

Main Results:

  • ICI provides equivalent Li+ diffusion information to GITT within a specific timeframe.
  • Experimental data shows strong agreement between ICI and GITT under semi-infinite diffusion conditions.
  • Continuous Li+ diffusion coefficient monitoring using ICI correlates with structural changes in LiNi0.8Mn0.1Co0.1O2 electrodes.

Conclusions:

  • The ICI method is a reliable, accurate, and faster technique for determining Li+ diffusion coefficients.
  • ICI offers significant advantages for operando characterization of battery materials.
  • This method enhances understanding of electrode material behavior during electrochemical cycling.