ae8b02008_si_001.pdf (1022.68 kB)
Interface-Enabled Ion Conduction in Li10GeP2S12–Poly(ethylene Oxide) Hybrid Electrolytes
journal contribution
posted on 2019-01-18, 00:00 authored by Jin Zheng, Pengbo Wang, Haoyu Liu, Yan-Yan HuOrganic–inorganic hybrid solid
electrolytes are expected to integrate the merits of both moieties
for addressing the challenges in achieving fast ion conduction and
high stability for energy storage applications. Li10GeP2S12 (LGPS)-poly(ethylene oxide) (PEO) (bis(trifluoromethane)sulfonimide
lithium (LiTFSI)) hybrid electrolytes have been prepared, which exhibit
ionic conductivities up to 0.22 mS cm–1 and good
long-term cycling stability against Li-metal. High-resolution solid-state 6Li NMR is employed to examine the local structural environments
of Li ions in the LGPS-PEO (LiTFSI) hybrids, which identifies Li ions
from PEO (LiTFSI), in bulk LGPS, and at LGPS-PEO interfaces. Tracer-exchange
Li NMR reveals that Li ions transport mainly through LGPS-PEO interfaces.
The impact of LGPS and LiTFSI contents on the interface chemistry
within LGPS-PEO hybrid electrolytes has been examined. The measured
conductivities of LGPS-PEO hybrids positively correlate with the available
Li ions at LGPS-PEO interfaces. This study provides insights for engineering
interfaces in organic–inorganic hybrids to develop high-performance
electrolytes for solid-state rechargeable batteries.