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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Fluorine-rich interface for garnet-based high-performance all-solid-state lithium batteries.

Shruti Suriyakumar1, Indu M Santhakumari1, Souvik Ghosh1,2

  • 1School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India shruti@iisertvm.ac.in shaiju@iisertvm.ac.in.

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|April 10, 2025
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This study introduces a novel fluorine-rich interface for composite polymer electrolytes (CPEs) in solid-state batteries, enhancing safety and energy density. The improved CPE demonstrates superior ionic conductivity and long-term cycling stability for lithium batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid-state batteries offer enhanced safety and energy density over traditional lithium-ion batteries.
  • Composite polymer electrolytes (CPEs) combine advantages of polymer and ceramic electrolytes but face interface challenges at high ceramic loadings.
  • Existing CPEs struggle with performance degradation due to polymer-filler interface issues when ceramic content exceeds 20%.

Purpose of the Study:

  • To develop an efficient strategy for improving the performance of composite polymer electrolytes (CPEs) for solid-state batteries.
  • To address the polymer-filler interface limitations in CPEs at high ceramic loadings (>20%).
  • To enhance the safety, ionic conductivity, and cycling stability of solid-state lithium batteries.

Main Methods:

  • Fabrication of a rationally designed composite polymer electrolyte (CPE) with 40% ceramic loading.
  • Introduction of an in situ-formed fluorine-rich interface between lithium anode, ceramic fillers, and the CPE.
  • Electrochemical characterization including Li-ionic conductivity measurements and Li|Li symmetric cell cycling.
  • Fabrication and testing of all-solid-state Li//LFP full cells.
  • Computational validation of fluorine's role in conductivity enhancement.

Main Results:

  • The developed CPE with 40% ceramic loading achieved high Li-ionic conductivity (10⁻⁴ S cm⁻¹ @ 55 °C).
  • The Li|Li symmetric cell demonstrated impressive cycling stability, exceeding 2000 cycles at 0.1 mA cm⁻².
  • All-solid-state Li//LFP full cells delivered a discharge capacity of 140 mA h g⁻¹ at 0.1C and 70 °C with good cycling stability.
  • The fluorine-rich interface significantly improved conductivity and cycling performance, as confirmed by computations.

Conclusions:

  • An efficient strategy using an in situ-formed fluorine-rich interface overcomes polymer-filler interface issues in high-ceramic-loading CPEs.
  • The optimized CPE enables high ionic conductivity, excellent cycling stability in symmetric cells, and robust performance in full cells.
  • This approach significantly advances the development of safer and higher-energy-density solid-state batteries.