Study of Graphite Cycling in Sulfide Solid Electrolytes

We report the excellent cycling stability of graphite in combination with two types of sulfide solid electrolytes, 0.75Li2S-0.25P2S5 (LPS) and 0.3LiI-0.7(0.75Li2S-0.25P2S5), and discuss the stability of the graphite-solid electrolyte interface by analyzing the normalized cumulative irreversible char...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2020-01, Vol.167 (11), p.110558
Main Authors: Höltschi, Laura, Jud, Franziska, Borca, Camelia, Huthwelker, Thomas, Villevieille, Claire, Pelé, Vincent, Jordy, Christian, El Kazzi, Mario, Novák, Petr
Format: Article
Language:English
Subjects:
all-solid-state lithium batteries
Chemical Sciences
electrolyte degradation
graphite electrode
interface
sulfide solid electrolyte
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Summary:We report the excellent cycling stability of graphite in combination with two types of sulfide solid electrolytes, 0.75Li2S-0.25P2S5 (LPS) and 0.3LiI-0.7(0.75Li2S-0.25P2S5), and discuss the stability of the graphite-solid electrolyte interface by analyzing the normalized cumulative irreversible charge and the total amount of lithium consumed at the lithiated state. The rate limitations and the influence of the morphology and the size of graphite particles on the utilization of the electrode are studied as well. At higher current densities, the utilization of the graphite is decreasing as a consequence of the poor effective ionic conductivity of the composite electrode, which is also evidenced by the increasing polarization and ohmic resistance across the electrode.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/aba36f