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Electrogravimetric Analysis: Overview01:30

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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
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Degradation Mechanism Induced by Depth-Dependent Inhomogeneity in Thick High-Areal-Capacity Graphite Electrode.

Kun-Hee Ko1, Kyoungoh Kim1, Youngsu Kim1

  • 1Department of Materials Science and Engineering, Institute for Rechargeable Battery Innovations, Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|March 24, 2025
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Summary

Thick lithium-ion battery electrodes degrade due to uneven reactions, causing lithium ion entrapment and hotspots. Protecting electrode surfaces can mitigate this degradation, improving battery performance and longevity.

Keywords:
degradation mechanismelectrode inhomogeneitygraphite anodelithium‐ion batteriesthick electrode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Thick electrodes are crucial for enhancing lithium-ion battery energy density.
  • High active material loading in electrodes often leads to performance decline and degradation.

Purpose of the Study:

  • To elucidate the degradation mechanism in high-loading graphite electrodes.
  • To identify the root causes of performance loss in thick battery electrodes.

Main Methods:

  • Investigated depth-dependent reaction inhomogeneity in thick graphite electrodes.
  • Analyzed lithium ion entrapment and current hotspot formation.
  • Evaluated the effect of electrode surface protection on degradation.

Main Results:

  • Identified lithium ion entrapment at the electrode bottom and current hotspots at the top as key degradation drivers.
  • Demonstrated that hotspots trigger excessive solid electrolyte interphase formation, increasing resistance.
  • Showed that surface protection mitigates side reactions and breaks a negative feedback loop.

Conclusions:

  • Degradation in thick electrodes is driven by a feedback loop between resistance and reaction inhomogeneity.
  • A comprehensive strategy involving enhanced diffusion and mitigated surface reactions is needed for high-loading electrodes.
  • Surface protection offers a viable approach to improve the stability of thick battery electrodes.