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The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Related Experiment Video

Updated: Jun 24, 2026

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Imaging dendrite growth in solid-state sodium batteries using fluorescence tomography technology.

Shuaishuai Yang1, Na Li2, Enyue Zhao2

  • 1School of Materials Science and Engineering, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

Science Advances
|November 20, 2024
PubMed
Summary

Researchers developed a 3D fluorescence tomography method to observe sodium dendrite growth in solid-state sodium batteries (SSBs). Optimizing Eu3+ doping in solid electrolytes achieved over a year of stable cycling performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Dendrite formation in solid-state sodium batteries (SSBs) significantly hinders battery efficiency and lifespan.
  • Understanding dendrite growth mechanisms is crucial for developing stable and high-performance SSBs.

Purpose of the Study:

  • To develop a 3D imaging technique for visualizing sodium dendrite growth in SSBs.
  • To investigate the evolution of dendrites during battery cycling.
  • To enhance the cycling stability of SSBs through material design.

Main Methods:

  • Designed a fluorescent Eu3+-doped Na3Zr2Si2PO12 solid electrolyte (SE).
  • Utilized fluorescence tomography (FT) with confocal laser scanning microscopy for 3D imaging.
  • Performed charge/discharge cycling tests at 25°C.

Main Results:

  • Observed the formation of small sodium islands, evolving into large dendrites (tens of micrometers).
  • Identified critical dendrite volumes leading to short circuits or performance degradation.
  • Achieved over 1 year (487.5 days) of stable sodium plating/stripping cycling by regulating Eu3+ doping.

Conclusions:

  • The developed FT method provides unprecedented 3D insights into sodium dendrite growth in SSBs.
  • Eu3+ doping in SEs is a viable strategy to significantly improve cycling stability.
  • This work paves the way for designing advanced solid electrolytes for high-performance SSBs.