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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.
Abstract:
Sulfide solid electrolytes are highly attractive for all-solid-state batteries because of their high ionic conductivity and favorable processability, yet their practical integration with Li metal anodes remains severely hindered by interfacial instability. Here, we report a simple surface-regulation strategy by coating Li6PS5Cl (LPSC) with C6F13I (CFI) to construct a Li-compatible interfacial chemistry. X-ray photoelectron spectroscopy reveals the emergence of C-F and LiF species. The optimized LPSC@CFI5 maintains an ionic conductivity of 1.22 mS cm-1 while markedly increasing the critical current density from 0.9 to 1.5 mA cm-2. Moreover, the Li|LPSC@CFI5|Li symmetric cell exhibits prolonged and low polarized stripping/plating stability for 1000 h at 0.1 mA cm-2. When extended to LCO/LPSC/Li full cells, the CFI-modified electrolyte enables more stable charge/discharge behavior and improved cycling reversibility at 0.1 C. Our work offers a simple molecular strategy to improve the interfacial compatibility of sulfide solid electrolytes with Li metal, thereby advancing the practical development of sulfide-based all-solid-state batteries.
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