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Related Concept Videos

Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Photochemically-driven high-entropy oxide interphase for stable alkali-metal anodes.

Zhipeng Hu1, Yue Sun2, Qian Wang2

  • 1Academy of Interdisciplinary Studies on Intelligent Molecules, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China; Guangzhou Greater Bay Technology Co., Ltd., Guangzhou 511458, China.

Journal of Colloid and Interface Science
|December 22, 2025
PubMed
Summary

A new vacuum-ultraviolet photochemical condensation method rapidly creates high-entropy oxide (HEO) films to stabilize alkali metal battery anodes. This technique enables dendrite-free cycling, overcoming key challenges in battery technology.

Keywords:
High-entropy oxideInterfacial engineeringMetal anodePhotochemical condensationVacuum-ultraviolet

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Interfacial instability at the anode is a critical issue for alkali metal batteries.
  • High-entropy oxide (HEO) nanofilms offer potential for interface stabilization, but scalable synthesis methods are needed.

Purpose of the Study:

  • To develop a scalable and substrate-compatible synthesis strategy for stabilizing interphases in alkali metal batteries.
  • To investigate the efficacy of a novel fabrication method for HEO films.

Main Methods:

  • Vacuum-ultraviolet photochemical condensation (VPC) method utilizing high-energy photons (7.2 eV).
  • Room-temperature condensation of ultrathin (∼8 nm), dense, and uniform HEO films from metal-organic precursors.
  • Fabrication of HEO films with tunable compositions, combining dissimilar metallic elements.

Main Results:

  • The VPC method enables rapid (minutes), energy-efficient, and scalable fabrication of HEO interphases.
  • VPC-derived HEO films lower the Li nucleation overpotential by over 3-fold.
  • Dendrite-free cycling was achieved for over 550 cycles, demonstrating enhanced interfacial stability.

Conclusions:

  • The rapid, scalable, and energy-efficient VPC strategy provides a new avenue for designing high-entropy-based interphases.
  • This method addresses the lack of scalable synthesis for HEO films, paving the way for advanced metal batteries.