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Highly Stable Halide-Electrolyte-Based All-Solid-State Li-Se Batteries.

Xiaona Li1, Jianwen Liang1,2, Jung Tae Kim1

  • 1Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 3K7, Canada.

Advanced Materials (Deerfield Beach, Fla.)
|April 2, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a stable solid-state lithium-selenium battery using a halide electrolyte, Li3HoCl6, overcoming common issues like poor cycling and electrolyte decomposition for advanced energy storage.

Keywords:
all-solid-state batterieshalide solid electrolytesionic conductivitylithiation/delithiation mechanismsselenium cathodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Liquid-based lithium batteries face safety and stability challenges.
  • Solid-state lithium-sulfur (Li-S) and lithium-selenium (Li-Se) batteries offer improved safety but suffer from poor cycling stability due to interface resistance and electrolyte decomposition.

Purpose of the Study:

  • To develop an integrated solid-state Li-Se battery with enhanced cycling stability and electrochemical performance.
  • To investigate the use of a halide solid electrolyte with a wide electrochemical stability window.

Main Methods:

  • Fabrication of a solid-state Li-Se battery utilizing a halide Li3HoCl6 solid electrolyte.
  • Electrochemical characterization to assess cycling stability and capacity.
  • Theoretical calculations to elucidate the thermodynamic mechanism of lithiation/delithiation.

Main Results:

  • The Li3HoCl6 electrolyte demonstrated high ionic conductivity and a wide electrochemical stability window.
  • The electrolyte exhibited excellent stability against selenium and lithiated species, suppressing side reactions and preventing electrolyte/cathode degradation.
  • The developed battery achieved a high reversible capacity of 402 mAh g-1 after 750 cycles.

Conclusions:

  • The metal-halide-based solid-state Li-Se battery offers superior electrochemical performance and cycling stability.
  • The intrinsic properties of Li3HoCl6 are crucial for inhibiting degradation pathways.
  • This work provides a promising platform for solid-state batteries and other energy storage systems.