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Design for an Interface in Oxyhalide-Based All-Solid-State Lithium Metal Batteries.

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Researchers developed a new solid electrolyte interface (SEI) for all-solid-state lithium metal batteries by utilizing spontaneous reactions. This in situ SEI enhances interface stability and enables long-duration cycling and broad temperature performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Oxyhalide solid-state electrolytes (SSEs) offer high ionic conductivity and cathode compatibility but suffer from poor interface stability with lithium metal anodes in all-solid-state lithium metal batteries (ASSLMBs).
  • This interface instability hinders the practical application of ASSLMBs.

Purpose of the Study:

  • To engineer a stable solid electrolyte interface (SEI) for lithium metal anodes in ASSLMBs.
  • To improve the electrochemical performance and cycling stability of ASSLMBs by addressing interface compatibility issues.

Main Methods:

  • Utilized spontaneous reactions between SSEs and lithium metal to form an in situ SEI.
  • Adjusted SSE composition to promote the formation of a uniform, compact, and stable SEI.
  • Incorporated LiCl, LiF, and Y2O3 synergistically to enhance interface stability.

Main Results:

  • Achieved stable cycling of lithium symmetric cells (Li|LTOC-YF3|Li) for over 11,000 hours at 10.0 mA/cm2.
  • Demonstrated a high critical current density (CCD) of 12.7 mA/cm2.
  • Li|LTOC-YF3|NCM88 ASSLMB maintained 92% capacity retention over 150 cycles at 25 °C and showed excellent stability at 50 °C.
  • Li|LTOC-YF3|LCO ASSLMB exhibited a high specific capacity of 108 mAh/g at -50 °C.

Conclusions:

  • The in situ formed SEI, composed of LiCl, LiF, and Y2O3, significantly enhances interface stability in ASSLMBs.
  • The LTOC-YF3 SSE demonstrates remarkable electrochemical performance and stability across a wide temperature range (-50 °C to 50 °C).
  • This approach offers a promising strategy for developing high-performance ASSLMBs.