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Related Concept Videos

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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Polymer-Based Artificial Solid Electrolyte Interphase Layers for Li- and Zn-Metal Anodes: From Molecular Engineering

Jae-Hee Han1, Joonho Bae2

  • 1Department of Materials Science and Engineering, Gachon University, Seongnam 13120, Republic of Korea.

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|November 27, 2025
PubMed
Summary

Polymer artificial solid electrolyte interphases (SEIs) stabilize lithium and zinc metal anodes by managing interfacial chemistry and mechanical stability. Operando diagnostics guide molecular design for improved battery performance and scalability.

Keywords:
aqueous zinc metal anodesartificial solid electrolyte interphaselithium metal anodeoperando characterizationpolymer-based interphase

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Metal anodes offer high energy density but face interfacial stability challenges.
  • The solid electrolyte interphase (SEI) is critical for metal anode performance.
  • Current SEI evaluation often relies on post-mortem analysis, limiting understanding of dynamic processes.

Purpose of the Study:

  • To review polymer-based artificial SEI strategies for stabilizing Li and Zn metal anodes.
  • To highlight the importance of operando diagnostics for SEI design and evaluation.
  • To discuss metal-specific constraints and the development of predictive SEI interfaces.

Main Methods:

  • Categorization of polymer SEI strategies: side-chain/ionomer chemistry, dynamic/cross-linked networks, and polymer-ceramic hybrids.
  • Benchmarking SEI designs against metal-specific challenges (e.g., Li inactive accumulation, Zn HER).
  • Utilizing operando metrics like nucleation overpotential, interfacial impedance, and morphology analysis (e.g., Cryo-EM).

Main Results:

  • Different polymer SEI designs address specific anode requirements, indicating no universal solution.
  • Operando metrics provide crucial insights into SEI behavior under electrochemical cycling.
  • Successful SEI engineering requires consideration of electrolyte composition, cell configuration, and operating conditions.

Conclusions:

  • Polymer artificial SEIs are evolving from empirical recipes to predictive, transferable interfaces.
  • Multimodal operando diagnostics are key to closed-loop design workflows.
  • This approach facilitates the transition of Li- and Zn-metal batteries from coin-cell to prototype scale.