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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...

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Operando Spatial Pressure Mapping Analysis for Prototype Lithium Metal Pouch Cells Under Practical Conditions.

Kyobin Park1, Myungjae Lee1, Jongchan Song2

  • 1School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.

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Summary

This study introduces a new spatial pressure mapping technique to monitor lithium-ion battery health in real-time. The method correlates pressure changes with capacity fading, aiding in understanding battery degradation.

Keywords:
electrochemical performancefailure mechanismsinhomogeneitylithium metal electrodesoperandopouch cellspressure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Real-time battery status monitoring is crucial for safety and performance, especially during fast charging.
  • Existing operando techniques focus on microstructural changes in lab-scale cells, not macroscopic inhomogeneity in practical cells.
  • Macroscopic spatial inhomogeneity of lithium electroplating/stripping in pressurized pouch cells remains unmeasured in real-time.

Purpose of the Study:

  • To introduce a noninvasive operando technique for real-time macroscopic spatial pressure measurement in pressurized pouch cells.
  • To visualize dynamic spatial changes in lithium metal electrode morphology using pressure mapping and mechanical analysis.
  • To demonstrate the correlation between capacity fading and spatial pressure inhomogeneity under fast charging conditions.

Main Methods:

  • Development and application of a novel spatial pressure mapping analysis technique.
  • Operando measurement of spatial pressure changes in pressurized pouch cells during cycling.
  • Theoretical visualization of lithium metal electrode morphology using combined pressure mapping and mechanical analyses.
  • Comparative analysis of pouch cells under varied external pressures, electrolytes, and electrolyte-to-capacity ratios.

Main Results:

  • Successfully measured macroscopic spatial pressure changes in pressurized pouch cells noninvasively and quantitatively.
  • Theoretically visualized dynamic spatial changes in lithium metal electrode morphology.
  • Demonstrated a direct correlation between abrupt capacity fading and increased spatial pressure inhomogeneity during fast charging.
  • Identified the influence of external pressure, electrolyte type, and electrolyte/capacity ratio on pressure distribution and degradation.

Conclusions:

  • The spatial pressure mapping technique provides critical insights into real-time battery status in pressurized pouch cells.
  • This method aids in understanding the complex origins of cell degradation, particularly under demanding fast-charging conditions.
  • The findings offer a new approach for assessing battery health and improving the safety and longevity of energy storage systems.