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Multianion Synergism Boosts High-Performance All-Solid-State Lithium Batteries.

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New halide solid electrolytes (SEs) with mixed anions improve ionic conductivity and electrode compatibility for next-generation all-solid-state lithium batteries (ASSLBs). These advanced SEs enable stable, high-rate energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium batteries (ASSLBs) are promising for next-generation energy storage.
  • Advanced solid electrolytes (SEs) are crucial for ASSLB performance.
  • Improving ionic conductivity and electrode compatibility of SEs remains a challenge.

Purpose of the Study:

  • To develop novel solid electrolytes (SEs) for enhanced all-solid-state lithium battery (ASSLB) performance.
  • To investigate the effect of mixed halide anions on ionic conductivity and interfacial properties.
  • To evaluate the electrochemical performance of ASSLBs utilizing the developed SEs.

Main Methods:

  • Synthesis of Li3YCl6-2xBrxIx solid electrolytes with varying halide compositions (0 ≤ x ≤ 1).
  • Characterization of ionic conductivity, activation energy, and structural properties.
  • Evaluation of interfacial compatibility with Li4Ti5O12 (LTO) cathode and Li-In alloy anode.
  • Fabrication and electrochemical testing of ASSLBs, including rate capability and cycling stability.

Main Results:

  • Achieved high ionic conductivity (1.98 mS cm-1) and low activation energy (0.257 eV) in Li3YCl6-2xBrxIx SEs.
  • Demonstrated good compatibility with LTO cathode and Li-In alloy anode.
  • Observed in-situ formation of a LiI self-limited passivated interfacial layer, enhancing Li interface stability.
  • ASSLBs exhibited high-rate capability (up to 10C), excellent reversibility, and stable cycling (>2000 cycles at 1C, 93.7% retention after 1000 cycles at 2C).

Conclusions:

  • Mixed anion halide solid electrolytes offer a pathway to simultaneously improve ionic conductivity and interfacial stability in ASSLBs.
  • The developed Li3YCl6-2xBrxIx SEs show significant potential for high-performance ASSLB applications.
  • Hybrid anion-based SE design is a cost-effective strategy for enhancing halide SE performance.