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Interphase Formation of PEO:LiTFSI-LiPSCl Composite Electrolytes with Lithium Metal.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "Interphase Formation of PEO:LiTFSI-LiPSCl Composite Electrolytes with Lithium Metal."

Composite polymer electrolytes (CPEs), consisting of solid electrolyte particles embedded within a solid polymer electrolyte matrix, are promising materials for all-solid-state batteries due to their mechanical properties and scalable production process. In this study, CPEs consisting of
PEO:
LiTFSI blended with 1 wt%, 10 wt% and 40 wt% (CPE40) of LiPSCl electrolyte filler are prepared by a slurry-based process. The incorporation of LiPSCl improves the lithium ion conductivity from 0.84 mS cm (
PEO:
LiTFSI) to 3.6 mS cm (CPE40) at 80 °C. Surface-sensitive X-ray photoelectron spectroscopy reveals LiF, polysulfides and LiPO on the CPE surface, originating from decomposition reactions between
PEO:
LiTFSI and LiPSCl. The decomposition products influence the formation of the solid electrolyte interphase (SEI) at the lithium metal | CPE interface, resulting in a reduced SEI resistance of 3.3 Ω cm (CPE40) compared to 5.8 Ω cm (
PEO:
LiTFSI) at 80 °C. The SEI growth follows a parabolic rate law and the growth rate declines from 1.2 Ω cm h (
PEO:
LiTFSI) to 0.57 Ω cm h (CPE40) during thermal aging at 80 °C. By substituting CPEs for SPEs in lithium plating and stripping experiments, the increase in SEI resistance was reduced by more than 75%. In order to get a deeper understanding of the SEI formation process, in situ XPS measurements were carried out where lithium metal is successively deposited on the CPE sample and X-ray photoelectron spectroscopy is measured after each deposition step. On the basis of these measurements, a multistep decomposition mechanism is postulated, including the formation of LiF and LiS as key components of the SEI.

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Journal Details

This article was published in the following journal.

Name: ACS applied materials & interfaces
ISSN: 1944-8252
Pages:

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