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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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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Lithium-Diffusion Induced Capacity Losses in Lithium-Based Batteries.

David Rehnlund1,2, Zhaohui Wang3, Leif Nyholm1

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Summary

This review highlights a significant, yet overlooked, cause of capacity loss in rechargeable lithium batteries: lithium ion diffusion. Understanding and mitigating this diffusion-controlled lithium trapping is crucial for improving battery longevity and performance.

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agingcapacity decreaseconcentration gradientsdiffusionlithium redistributionlithium trappinglithium-based batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable lithium batteries suffer capacity fade, reducing energy and power densities.
  • Common causes include solid electrolyte interphase formation, volume changes, structural degradation, and metal ion dissolution.

Purpose of the Study:

  • To investigate diffusion-controlled lithium trapping as a significant, under-recognized source of capacity loss in lithium-based batteries.
  • To analyze the mechanisms and implications of this diffusion phenomenon.

Main Methods:

  • Review of published experimental data.
  • Analysis of recent research on lithium trapping effects.
  • Application of a diffusion-based model to understand capacity loss.

Main Results:

  • Evidence suggests diffusion of lithium atoms/ions due to concentration gradients causes incomplete electrode reactions.
  • This diffusion-controlled lithium trapping leads to capacity losses in both negative and positive electrode materials.
  • The study quantifies implications and compares them to other known capacity loss mechanisms.

Conclusions:

  • Diffusion-controlled lithium trapping is a critical factor in rechargeable battery degradation.
  • Strategies for identification and mitigation, such as battery regeneration, are discussed.
  • Further research is needed to fully address this phenomenon and enhance battery lifespan.