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Related Concept Videos

Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Electrode-Specific Janus Separator Towards High-Performance Lithium Metal Batteries.

Jeanie Pearl Dizon Suba1, Eunbin Lim1, Jaegu Cho1

  • 1Department of Materials Science and Chemical Engineering, Hanyang University ERICA, Ansan, Gyeonggi, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|January 15, 2026
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Summary

This study introduces a Janus separator to prevent lithium dendrites and transition metal dissolution in lithium metal batteries (LMBs). This dual-function separator enhances battery safety and longevity for next-generation energy storage.

Keywords:
dendrite suppressionelectrode‐specific coatingjanus separatorlithium metal batterytransition metal ion barrier

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal batteries (LMBs) offer high energy density but face degradation from anode dendrites and cathode transition metal (TM) dissolution.
  • These issues limit the practical application and safety of LMBs.

Purpose of the Study:

  • To develop a novel surface-engineered Janus separator for LMBs.
  • To simultaneously address Li dendrite formation at the anode and TM dissolution at the cathode.

Main Methods:

  • Fabrication of a Janus separator with distinct anode-facing and cathode-facing layers.
  • Anode layer: 315 nm polypyrrole-silicon oxide (Ppy-SiO2) network via vapor-phase printing for uniform Li+ flux and stability.
  • Cathode layer: Polydopamine-coated boehmite (PDA@BM) particles to capture and mitigate TM ion migration.

Main Results:

  • The Ppy-SiO2 layer effectively suppressed Li dendrite growth and improved thermal/mechanical stability.
  • The PDA@BM layer reduced TM ion migration by over 96%.
  • The Janus separator demonstrated superior interfacial stability and long-term cycling performance in LMBs.

Conclusions:

  • The proposed Janus separator design provides a synergistic solution to asymmetric degradation in LMBs.
  • This strategy enables compositionally distinct, directionally targeted layers for enhanced performance and safety.
  • The Janus separator is a promising approach for the practical realization of high-performance lithium metal batteries.