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All-solid-state Li-S batteries with fast solid-solid sulfur reaction.

Huimin Song1, Konrad Münch2,3, Xu Liu1

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|January 15, 2025
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Summary
This summary is machine-generated.

This study introduces a novel lithium thioborophosphate iodide glass-phase solid electrolyte for all-solid-state lithium-sulfur batteries. This breakthrough enables fast solid-solid sulfur redox reactions, enhancing battery performance and cycle life.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium-sulfur batteries (ASSLSBs) offer high energy, safety, and low cost for next-generation energy storage.
  • Poor rate performance and short cycle life in ASSLSBs are attributed to sluggish solid-solid sulfur redox reactions (SSSRR) at three-phase boundaries.

Purpose of the Study:

  • To address the limitations of ASSLSBs by enhancing the sluggish SSSRR.
  • To develop a novel solid electrolyte that can act as a redox mediator to accelerate SSSRR.

Main Methods:

  • Development of lithium thioborophosphate iodide (LBPSI) glass-phase solid electrolytes (GSEs).
  • Utilizing the reversible redox of I-/I2/I3- within the solid electrolyte as a surficial redox mediator.
  • Investigating the impact of the redox mediator on the density of active sites and reaction kinetics.

Main Results:

  • The LBPSI GSE facilitated fast SSSRR, significantly increasing the density of active sites.
  • ASSLSBs demonstrated ultrafast charging with a capacity of 1,497 mAh g−1sulfur at 2C and maintained 784 mAh g−1sulfur at 20C.
  • Exceptional performance was observed at extreme rates (432 mAh g−1sulfur at 150C, 60°C) and cycle stability (80.2% retention over 25,000 cycles at 5C).

Conclusions:

  • The developed LBPSI GSE effectively mediates SSSRR, overcoming previous limitations in ASSLSBs.
  • This redox-mediated approach enables high-rate capability and superior cycling stability for ASSLSBs.
  • The findings pave the way for advanced, high-energy, and safe ASSLSBs.