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Measuring Dynamic Gradients in Drying Battery Electrode Coatings via Microscale Resistivity.

Emre Baburoglu1, Karla Negrete2, Maureen H Tang3

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Summary
This summary is machine-generated.

A new low-cost in situ method reveals how shear rate affects lithium-ion battery electrode microstructure during drying. This understanding is key for improving battery performance and manufacturing processes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • In situ techniques for studying lithium-ion battery (LIB) electrode microstructural evolution are often costly or inaccessible.
  • Previous research suggests superior LIB performance with electrodes coated at high shear rates, potentially due to differences in carbon connectivity.
  • Understanding the dynamic microstructural changes during electrode drying is crucial for optimizing battery performance.

Purpose of the Study:

  • To demonstrate a simple, cost-effective four-line probe for measuring dynamic electrode microstructures in situ.
  • To investigate the effects of coating shear rate on the transient and final microstructure of LIB electrodes during drying.
  • To elucidate the drying mechanisms influenced by shear rate and their impact on electrode properties.

Main Methods:

  • Utilized a cost-effective four-line probe device to measure electrode resistance at varying penetration depths.
  • Applied heuristic drying models to interpret resistivity data and propose drying mechanisms.
  • Validated findings using electrochemical fluorescence microscopy (EFM) and energy dispersive spectroscopy (EDS) imaging of dried electrodes.

Main Results:

  • Electrode resistance measurements showed distinct dynamic microstructural differences between high and low shear rates, indicating varied drying mechanisms.
  • Observed aggregation and sedimentation of carbon particles at early drying stages for low shear rates.
  • Identified the formation of a carbon-rich top layer during drying for both shear rates, confirmed by EFM and EDS.

Conclusions:

  • The low-cost, in situ four-line probe method effectively captures shear-dependent microstructural evolution during composite electrode drying.
  • Shear rate significantly influences drying mechanisms, leading to different microstructures and impacting battery performance.
  • This study provides a comprehensive understanding of shear effects on electrode development, crucial for advanced battery manufacturing.