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Halide solid-state electrolytes for all-solid-state batteries: structural design, synthesis, environmental stability,

Boran Tao1,2, Dailin Zhong1, Hongda Li1,2

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This summary is machine-generated.

Halide solid-state electrolytes (SSEs) offer balanced properties for all-solid-state batteries (ASSBs). Chloride-based materials with monoclinic structures show promise for high ionic conductivity and stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Halide solid-state electrolytes (SSEs) have emerged as promising alternatives to liquid electrolytes in all-solid-state batteries (ASSBs).
  • Compared to oxide and sulfide SSEs, halide SSEs exhibit a superior balance of ionic conductivity, electrochemical stability, and moisture resistance.
  • Significant research advancements since 2018 have fueled interest in halide SSEs for next-generation energy storage.

Purpose of the Study:

  • To provide a comprehensive overview of halide SSEs, focusing on their fundamental principles, structural design, and practical applications in ASSBs.
  • To elucidate the key factors governing the selection of halide SSE components and their structural optimization for enhanced ionic conductivity.
  • To analyze the mechanisms of moisture resistance and explore scalable synthesis methods for halide SSEs.

Main Methods:

  • Component screening based on electronegativity and ionic properties, favoring chloride anions and specific elements like Sc, Y, and lanthanides.
  • Structural analysis, identifying monoclinic structures as optimal for lithium ion migration compared to trigonal and orthorhombic phases.
  • Exploration of substitution strategies, including dual-halogen, isovalent, and aliovalent cation substitutions, to tune electrolyte properties.
  • Investigation of moisture resistance mechanisms and synthesis techniques, with a focus on wet chemical methods for scalability.

Main Results:

  • Chloride anions demonstrate excellent ionic conductivity and electrochemical stability, making them ideal SSE components.
  • Monoclinic crystal structures facilitate efficient lithium ion transport, crucial for high battery performance.
  • Wet chemical synthesis methods are identified as more suitable for large-scale production of halide SSEs compared to solid-state or mechanochemical routes.
  • Substitution strategies offer tunable properties for optimizing halide SSEs for ASSB applications.

Conclusions:

  • Halide SSEs, particularly chloride-based compounds with optimized structures, present a viable pathway for developing high-performance ASSBs.
  • Understanding component selection, structural design, and synthesis methods is critical for advancing halide SSE technology.
  • Further research into application prospects and challenges is necessary to realize the full potential of halide SSEs in commercial ASSBs.