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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Room-Temperature Pseudo-Solid-State Iron Fluoride Conversion Battery with High Ionic Conductivity.

Aliya S Lapp1, Laura C Merrill2, Bryan R Wygant3

  • 1Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States.

ACS Applied Materials & Interfaces
|December 20, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a novel pseudo-solid-state lithium-metal battery using iron fluoride cathodes and a localized high-concentration electrolyte gel. This design enables stable, high-rate cycling at room temperature, overcoming limitations of previous solid-state batteries.

Keywords:
batteriesconversiongel polymer electrolytesionogelsiron fluoridelocalized high-concentration electrolytespseudo-solid state

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-metal batteries (LMBs) with conversion cathodes like FeF3 offer high energy density and cost-effectiveness.
  • Solid-state LMBs promise enhanced safety but suffer from poor ionic conductivity and interfacial resistance.
  • Pseudo-solid-state ionogel separators aim to combine the benefits of solid-state and liquid electrolyte systems.

Purpose of the Study:

  • To develop a pseudo-solid-state conversion battery (Li-FeF3) with improved performance at room temperature.
  • To investigate the use of a localized high-concentration electrolyte (LHCE) gel in ionogel separators for Li-FeF3 cathodes.
  • To demonstrate stable, high-rate cycling performance for flexible and custom-shaped battery architectures.

Main Methods:

  • Preparation of FeF3 cathodes by infiltrating a polymer ionogel with a localized high-concentration electrolyte (LHCE).
  • Fabrication of pseudo-solid-state Li-FeF3 batteries utilizing the LHCE-gel infiltrated ionogel separators.
  • Electrochemical testing, including cycling performance at high current densities (1.0 mA cm-2) at room temperature.

Main Results:

  • Achieved stable, high-rate (1.0 mA cm-2) cycling of Li-FeF3 batteries at room temperature.
  • The LHCE gel provided high ionic conductivity (approx. 2 mS cm-1 at 25 °C) and chemical stability.
  • The flexible nature of the gel separator accommodated volume changes during battery cycling.

Conclusions:

  • The developed LHCE gel-based pseudo-solid-state battery overcomes the poor ionic conductivity limitations of previous solid-state iron fluoride batteries.
  • This approach enables practical power levels at room temperature, unlike previous systems requiring elevated temperatures.
  • The findings pave the way for advanced battery designs, including flexible, 3D, and custom-shaped configurations.