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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Li-Fe-Cl Families as Novel Solid Electrolytes for All-Solid-State Batteries.

Futing Sun1, Zesen Gao1, Yan Yang1

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

ACS Applied Materials & Interfaces
|October 3, 2024
PubMed
Summary

Researchers developed a new halide solid electrolyte, Li1.8Fe1.1Cl4, significantly enhancing ionic conductivity for solid-state batteries. This advancement offers a promising alternative to traditional electrolytes.

Keywords:
Li−Fe−Clall-solid-state batterydopinghalidesionic conductivitiessolid electrolytes

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Published on: March 7, 2018

Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Halide solid electrolytes are gaining attention due to their synthesis ease, electrochemical stability, and ionic conductivity.
  • However, halide electrolytes remain less studied compared to oxide and sulfide counterparts.
  • Li-Fe-Cl phases, specifically Li2FeCl4 and Li6FeCl8, present potential as novel solid electrolyte materials.

Purpose of the Study:

  • To investigate the electrochemical properties of Li-Fe-Cl phases as solid electrolytes.
  • To enhance the ionic conductivity of Li2FeCl4 through material modification.
  • To evaluate the performance of a Li-Fe-Cl based solid electrolyte in an all-solid-state battery.

Main Methods:

  • Synthesis and characterization of Li-Fe-Cl phases.
  • Application of a self-doping approach to create Li vacancies in Li1.8Fe1.1Cl4.
  • Electrochemical testing including ionic conductivity measurements and cycling stability in a Li|Li1.8Fe1.1Cl4|Li half-cell.
  • Assembly and testing of an all-solid-state battery utilizing Li1.8Fe1.1Cl4 as the solid electrolyte.

Main Results:

  • Achieved a maximum ionic conductivity of 2.0 × 10-4 S cm-1 at 50 °C for Li1.8Fe1.1Cl4, a three-order-of-magnitude improvement over pristine Li2FeCl4.
  • Demonstrated stable cycling for 2000 hours in a Li|Li1.8Fe1.1Cl4|Li half-cell at 50 °C, indicating good Li-ion compatibility.
  • Successfully assembled an all-solid-state battery with an initial specific charge capacity of 76.36 mAh g-1 at 0.1C and 50 °C, with 73.06% initial Coulombic efficiency.

Conclusions:

  • Li2FeCl4 is a promising new halide solid electrolyte material.
  • Introducing lithium vacancies via self-doping is an effective strategy to significantly enhance the electrochemical performance of halide solid electrolytes.
  • The developed Li1.8Fe1.1Cl4 shows potential for practical applications in solid-state batteries.