Suppression mechanism for dissolution of Conversion-Type CuCl2 Electrode in LiPF6/methyl difluoroacetate electrolyte

Katsuo Hashizaki; Shinsaku Dobashi; Shigeto Okada; Toshiro Hirai; Jun Ichi Yamaki; Zempachi Ogumi

doi:10.1149/2.0461904jes

Suppression mechanism for dissolution of Conversion-Type CuCl₂ Electrode in LiPF₆/methyl difluoroacetate electrolyte

Katsuo Hashizaki, Shinsaku Dobashi, Shigeto Okada, Toshiro Hirai, Jun Ichi Yamaki, Zempachi Ogumi

Advanced Device Materials

Research output: Contribution to journal › Article

Abstract

As the cathode materials in conversion-type lithium ion batteries, transition-metal chlorides are well-known to easily dissolve in many organic solvents. However, the LiPF₆/methyl difluoroacetate (MFA; CHF₂COOCH₃) electrolyte is effective in suppressing the dissolution of the CuCl₂ electrode, as reported for a Li/CuCl₂ battery. This effect did not arise in the MFA solvent without LiPF₆, but did on slightly dissolving LiPF₆ in the MFA solvent. This was because a very small amount of film was formed on the surface of the CuCl₂ electrode due to the addition of the small amount of LiPF6, and the film was composed of copper fluoride hydroxide, partial release of Cl from CuCl₂, and CuCl.

Original language	English
Pages (from-to)	A568-A573
Journal	Journal of the Electrochemical Society
Volume	166
Issue number	4
DOIs	https://doi.org/10.1149/2.0461904jes
Publication status	Published - Jan 1 2019

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

Cite this

Hashizaki, K., Dobashi, S., Okada, S., Hirai, T., Yamaki, J. I., & Ogumi, Z. (2019). Suppression mechanism for dissolution of Conversion-Type CuCl₂ Electrode in LiPF₆/methyl difluoroacetate electrolyte. Journal of the Electrochemical Society, 166(4), A568-A573. https://doi.org/10.1149/2.0461904jes

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abstract = "As the cathode materials in conversion-type lithium ion batteries, transition-metal chlorides are well-known to easily dissolve in many organic solvents. However, the LiPF6/methyl difluoroacetate (MFA; CHF2COOCH3) electrolyte is effective in suppressing the dissolution of the CuCl2 electrode, as reported for a Li/CuCl2 battery. This effect did not arise in the MFA solvent without LiPF6, but did on slightly dissolving LiPF6 in the MFA solvent. This was because a very small amount of film was formed on the surface of the CuCl2 electrode due to the addition of the small amount of LiPF6, and the film was composed of copper fluoride hydroxide, partial release of Cl from CuCl2, and CuCl.",

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T1 - Suppression mechanism for dissolution of Conversion-Type CuCl2 Electrode in LiPF6/methyl difluoroacetate electrolyte

AU - Hashizaki, Katsuo

AU - Dobashi, Shinsaku

AU - Okada, Shigeto

AU - Hirai, Toshiro

AU - Yamaki, Jun Ichi

AU - Ogumi, Zempachi

PY - 2019/1/1

Y1 - 2019/1/1

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AB - As the cathode materials in conversion-type lithium ion batteries, transition-metal chlorides are well-known to easily dissolve in many organic solvents. However, the LiPF6/methyl difluoroacetate (MFA; CHF2COOCH3) electrolyte is effective in suppressing the dissolution of the CuCl2 electrode, as reported for a Li/CuCl2 battery. This effect did not arise in the MFA solvent without LiPF6, but did on slightly dissolving LiPF6 in the MFA solvent. This was because a very small amount of film was formed on the surface of the CuCl2 electrode due to the addition of the small amount of LiPF6, and the film was composed of copper fluoride hydroxide, partial release of Cl from CuCl2, and CuCl.

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10.1149/2.0461904jes