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Updated: Jul 15, 2026
06:44
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Molecular Halofluorocarbon Regulation of Li Metal/Li6PS5Cl Interfaces Through a C6F13I-Derived LiF/LiI-Rich
Hanhan Liu1, Jiyu Huang1, Wenwen Deng1
1School of Materials Science and Engineering, Anhui University, Hefei, Anhui, P. R. China.
Summary
Researchers developed a surface coating for sulfide solid electrolytes, enhancing stability with lithium metal anodes in all-solid-state batteries. This improves critical current density and cycling performance for safer, more efficient energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Sulfide solid electrolytes offer high ionic conductivity and processability for all-solid-state batteries.
- Interfacial instability between sulfide electrolytes and lithium metal anodes limits practical applications.
Purpose of the Study:
- To develop a simple surface-regulation strategy for improving the interfacial compatibility of Li6PS5Cl (LPSC) with lithium metal anodes.
- To enhance the stability and performance of sulfide-based all-solid-state batteries.
Main Methods:
- Coating Li6PS5Cl (LPSC) with C6F13I (CFI) to form LPSC@CFI.
- Characterization using X-ray photoelectron spectroscopy (XPS).
- Electrochemical testing of symmetric cells and full cells (LCO/LPSC@CFI5/Li).
Main Results:
- The LPSC@CFI5 coating formed Li-compatible interfacial chemistry with C-F and LiF species.
- Ionic conductivity of LPSC@CFI5 remained high (1.22 mS cm⁻¹).
- Critical current density increased from 0.9 to 1.5 mA cm⁻², and symmetric cells showed 1000h stability.
- Full cells exhibited improved charge/discharge stability and cycling reversibility.
Conclusions:
- A simple molecular strategy using C6F13I coating effectively regulates the LPSC interface with lithium metal.
- This approach significantly enhances interfacial stability, paving the way for practical sulfide-based all-solid-state batteries.
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