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Ferroelectric-Field-Steered SEI Engineering for Long-Life Lithium-Metal Batteries.

Hongfei Bao1, Bin Wang1, Jiayi Zhang2

  • 1School of Materials, Sun Yat-sen University, Shenzhen, 518107, China.

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|December 15, 2025
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Summary

Researchers developed a new method to control the solid-electrolyte interphase (SEI) in lithium-metal batteries using electric fields. This approach enhances battery stability and lifespan by creating a protective, inorganic-rich SEI layer, preventing dendrite growth.

Keywords:
Electric‐Field VectorFerroelectric MOF InterlayerInorganic‐Dominant SEIInterfacial Ion Distribution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Designing a stable solid-electrolyte interphase (SEI) is crucial for high-performance lithium-metal batteries.
  • Current methods for SEI regulation are limited by thermodynamic constraints, hindering control over interfacial reactions.

Purpose of the Study:

  • To introduce a novel strategy for actively reconfiguring the interfacial double layer and SEI chemistry using an electric-field vector.
  • To engineer an inorganic-dominant SEI layer that effectively suppresses lithium dendrite growth.

Main Methods:

  • Utilized a ferroelectric metal-organic-framework (MOF) interlayer to establish a built-in reverse electric field.
  • Employed the electric-field vector as a geometric order parameter to guide interfacial reactions.
  • Analyzed the resulting SEI composition and its impact on battery performance.

Main Results:

  • The electric field promoted preferential anion reduction, forming an inorganic-dominant SEI (LiF/Li2O).
  • Lithium||Lithium symmetric cells demonstrated stable cycling for 2000 hours with low polarization (<20 mV).
  • Lithium iron phosphate (LiFePO4) full cells retained over 95% capacity after 1000 cycles.

Conclusions:

  • The electric-field-driven interface engineering strategy offers a new dimension for developing safe and durable high-energy batteries.
  • This approach moves beyond traditional material screening, enabling precise control over SEI formation.
  • Ferroelectric MOFs provide a viable platform for implementing electric-field control in battery interfaces.