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Related Concept Videos

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Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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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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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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Quantifying Diffusion through Interfaces of Lithium-Ion Battery Active Materials.

Peter Benedek1, Ola K Forslund2, Elisabetta Nocerino2

  • 1Department of Information Technology and Electrical Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.

ACS Applied Materials & Interfaces
|March 13, 2020
PubMed
Summary

Investigating charge diffusion in lithium-ion batteries using muon spin spectroscopy reveals distinct interfacial processes. Surface engineering of active materials like LiFePO4 can enhance battery performance by optimizing ion transport.

Keywords:
LiFePO4ab initio simulationscyclic voltammetrylithium-ion batteriesmuon spin spectroscopysolid-state diffusion

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physics

Background:

  • Understanding charge diffusion in lithium-ion batteries is key for improving performance.
  • Interfacial diffusion resistance can limit battery charge/discharge rates.
  • Experimental methods for studying interfacial diffusion are needed.

Purpose of the Study:

  • To investigate charge diffusion at the interface of active battery materials.
  • To compare interfacial diffusion with bulk diffusion in LiFePO4 particles.
  • To correlate interfacial diffusion measurements with electrochemical performance.

Main Methods:

  • Muon spin spectroscopy was employed to study diffusion.
  • Measurements were conducted on LiFePO4 platelets of varying sizes.
  • Ab initio calculations were used to support experimental findings.
  • Cyclic voltammetry was performed to assess electrochemical relevance.

Main Results:

  • Muon spin spectroscopy successfully probed interfacial diffusion.
  • Diffusion rates at the LiFePO4 (010) interface were quantified and compared to bulk diffusion.
  • Ab initio calculations provided insights into the diffusion mechanisms.
  • Interfacial diffusion characteristics were linked to battery performance.

Conclusions:

  • Interfacial diffusion in lithium-ion battery materials can be distinct from bulk diffusion.
  • Surface engineering strategies can be developed to optimize interfacial ion transport.
  • This approach offers a pathway to enhance lithium-ion battery performance.