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Rate-Determining Process at Electrode/Electrolyte Interfaces for All-Solid-State Fluoride-Ion Batteries.

Datong Zhang1, Hiroyuki Nakano2,3, Kentaro Yamamoto1

  • 1Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu Cho, Sakyo, Kyoto 606-8501, Japan.

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|June 21, 2021
PubMed
Summary
This summary is machine-generated.

Developing solid electrolytes for fluoride-ion batteries (FIBs) is challenging. Annealing tetragonal β-Pb0.78Sn1.22F4 enhanced ionic conductivity, revealing fluoride-ion conduction as the rate-limiting step for improved battery performance.

Keywords:
all-solid-state batteryelectrolyteinterfaceskineticsrate-determining steps

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Ionics

Background:

  • High-performance solid electrolytes operable at room temperature are crucial for all-solid-state fluoride-ion batteries (FIBs).
  • Tetragonal β-Pb0.78Sn1.22F4 is a promising solid electrolyte material for mild-temperature applications.

Purpose of the Study:

  • To modify β-Pb0.78Sn1.22F4 through annealing to enhance its properties for FIBs.
  • To investigate the rate-determining factors of electrode/electrolyte interface reactions in all-solid-state FIBs.

Main Methods:

  • Thin-film models of β-Pb0.78Sn1.22F4 were annealed under various atmospheres.
  • Ionic conductivities were measured.
  • Chronoamperometric measurements and Allen-Hickling simulations were used to determine the interfacial reaction rate constant (k⁰).

Main Results:

  • Annealed samples showed preferential growth and enhanced ionic conductivities.
  • Fluoride-ion conduction was identified as the rate-determining process at the electrode/electrolyte interface.
  • β-Pb0.78Sn1.22F4 exhibited a larger interfacial rate constant (k⁰) than Li7La3Zr2O12.

Conclusions:

  • Annealing is an effective method to improve the performance of β-Pb0.78Sn1.22F4 solid electrolytes.
  • High ionic conductivity in solid electrolytes is key to achieving superior rate capabilities in all-solid-state FIBs.
  • Developed solid electrolytes could enable all-solid-state FIBs with performance comparable to all-solid-state Li-ion batteries.