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Embedding Fe-Based Redox Chemistry Into Low-Cost Oxyhalide Solid Electrolytes for High-Performance All-Solid-State

Zhimin Zhou1,2,3, Pushun Lu1,2,4, Suzhe Liang1,2,4

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Researchers developed a new iron-based solid electrolyte (LiZrFeOCl-1604) for all-solid-state batteries (ASSBs). This cost-effective material enhances energy density and battery safety, paving the way for next-generation energy storage solutions.

Keywords:
active halide solid electrolyteall solid state lithium batteriescatholyte solid electrolytehigh energy density

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Halide solid electrolytes (SEs) are crucial for all-solid-state batteries (ASSBs) due to their high ionic conductivity and electrochemical stability.
  • However, their limited electrochemical activity and high cost hinder the energy density and practical application of ASSBs.

Purpose of the Study:

  • To develop a cost-effective and electrochemically active solid electrolyte by integrating Fe2O3 into Li2ZrCl6 (LZC).
  • To enable Fe-based redox chemistry within the solid electrolyte to enhance battery performance.

Main Methods:

  • Synthesis of an oxyhalide solid electrolyte (Li1.6ZrFe0.8O1.2Cl5.6, LiZrFeOCl-1604) by incorporating Fe2O3 into LZC.
  • Characterization of the material's structure, ionic conductivity, and electrochemical properties.
  • Fabrication and testing of ASSBs using LiFePO4 (LFP) cathode and the novel solid electrolyte.

Main Results:

  • LiZrFeOCl-1604 exhibited high ionic conductivity (2.55 mS cm-1) and reversible capacity (163 mAh g-1).
  • The composite electrode with LFP cathode achieved a high capacity (321.6 mAh g-1) and energy density (982.1 Wh kg-1), a 101.8% increase over inactive LZC.
  • ASSBs demonstrated excellent cycling stability, retaining 92.7% capacity over 800 cycles at 1C.

Conclusions:

  • The developed electrochemically active oxyhalide solid electrolyte enhances energy density and cost-effectiveness for ASSBs.
  • The asynchronous charge-discharge behavior improves practical energy density and mitigates safety risks like overcharge/overdischarge.
  • This work presents a promising pathway for advanced, safer, and high-performance all-solid-state batteries.