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Updated: Jul 2, 2025

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Li ions traffic controller on thin lithium metal anode: Regulating deposition, optimizing and protecting solid

Mengli Tao1, Guangyuan Du2, Wenwu Zou1

  • 1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.

Journal of Colloid and Interface Science
|February 29, 2024
PubMed
Summary

A novel coating layer stabilizes thin lithium metal anodes by controlling lithium-ion flow and optimizing the solid electrolyte interphase (SEI). This enhances battery lifespan and performance, crucial for next-generation energy storage.

Keywords:
Coating layerLi(+) traffic controllerLow N/P ratioSEI component optimizationThin lithium metal anode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Thin lithium metal anodes are critical for high-energy-density batteries.
  • Electrode-electrolyte interphase instability hinders lithium metal anode performance and cycle life.
  • Developing stable interfaces is key to advancing lithium metal battery technology.

Purpose of the Study:

  • To develop a protective coating for stabilizing thin lithium metal anodes.
  • To investigate the role of a Li+ traffic controller in regulating lithium deposition.
  • To enhance the stability and performance of lithium metal batteries.

Main Methods:

  • Fabrication of a coating layer using hexadecyl trimethyl ammonium bis(trifluoromethanesulphonyl)imide ([CTA][TFSI]) and poly(vinylidene difluoride-co-hexafluoropropylene) (P(VDF-HFP)).
  • Characterization of the coating's effect on Li+ distribution and solid electrolyte interphase (SEI) formation.
  • Performance evaluation in Li||Li symmetric cells and full cells under various current densities and cycles.

Main Results:

  • The coating layer effectively regulated Li+ concentration, promoting uniform lithium deposition.
  • The [CTA][TFSI] anion optimized the SEI with inorganic-rich components, enhancing ionic conductivity.
  • Li||Li symmetric cells showed a lifespan of 600 hours at 1 mA cm-2.
  • Full cells with an ultra-low N/P ratio demonstrated stable cycling over 200 cycles at 0.5C and 90 cycles at 1C.

Conclusions:

  • The developed coating layer significantly enhances the stability and cycle life of thin lithium metal anodes.
  • This approach offers a promising strategy for overcoming interfacial challenges in lithium metal batteries.
  • The Li+ traffic controller and optimized SEI contribute to improved battery performance and longevity.