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Effect of Fluorine Substitution in Li3YCl6 Chloride Solid Electrolytes for All-solid-state Battery

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Bibliographic Details
Title: Effect of Fluorine Substitution in Li3YCl6 Chloride Solid Electrolytes for All-solid-state Battery
Authors: Mariya YAMAGISHI, Chengchao ZHONG, Daisuke SHIBATA, Mayu MORIMOTO, Yuki ORIKASA
Source: Electrochemistry, Vol 91, Iss 3, Pp 037002-037002 (2023)
Publisher Information: The Electrochemical Society of Japan, 2023.
Publication Year: 2023
Subject Terms: solid electrolyte, Technology, Physical and theoretical chemistry, QD450-801, all-solid-state battery, fluorine substitution, decomposition reaction
Description: All-solid-state batteries experience irreversible capacity loss particularly in the initial potential cycle, owing to electrolyte decomposition at the electrode/electrolyte interface. A strategy for expanding the oxidation stability of electrolytes is replacing the anion with fluorine. However, fluorine substitution has a negative influence on ionic conductivity. In this study, we introduced trace amounts of fluorine into Li3YCl6 solid electrolytes which exhibit high ionic conductivities and wide potential windows. The effect of replacement on ionic conductivity, oxidation stability, and charge–discharge characteristics were studied. The trace amounts of fluorine in Li3YCl6 did not reduce the conductivity, but improved the apparent oxidation stability. The decomposed product of LiF from the fluorine-substituted electrolyte disturbed the formation of a high-resistance layer at the electrode/electrolyte interface. The initial charge–discharge efficiency of the uncoated LiCoO2 cathode was improved by the trace amount of fluorine replacement in the Li3YCl6 solid electrolyte.
Document Type: Article
Language: English
ISSN: 2186-2451
DOI: 10.5796/electrochemistry.23-00005
Access URL: https://doaj.org/article/0947299c7f994ef5bd14712509c9f63f
Accession Number: edsair.doajarticles..6d0875df736329de4e426f6b9751afe6
Database: OpenAIRE
Description
Abstract:All-solid-state batteries experience irreversible capacity loss particularly in the initial potential cycle, owing to electrolyte decomposition at the electrode/electrolyte interface. A strategy for expanding the oxidation stability of electrolytes is replacing the anion with fluorine. However, fluorine substitution has a negative influence on ionic conductivity. In this study, we introduced trace amounts of fluorine into Li3YCl6 solid electrolytes which exhibit high ionic conductivities and wide potential windows. The effect of replacement on ionic conductivity, oxidation stability, and charge–discharge characteristics were studied. The trace amounts of fluorine in Li3YCl6 did not reduce the conductivity, but improved the apparent oxidation stability. The decomposed product of LiF from the fluorine-substituted electrolyte disturbed the formation of a high-resistance layer at the electrode/electrolyte interface. The initial charge–discharge efficiency of the uncoated LiCoO2 cathode was improved by the trace amount of fluorine replacement in the Li3YCl6 solid electrolyte.
ISSN:21862451
DOI:10.5796/electrochemistry.23-00005