Formation of SEI on cycled lithium-ion battery cathodes soft X-ray absorption study

M. Balasubramanian; H. S. Lee; X. Sun; X. Q. Yang; A. R. Moodenbaugh; J. McBreen; D. A. Fischer; Z. Fu

doi:10.1149/1.1423802

Formation of SEI on cycled lithium-ion battery cathodes soft X-ray absorption study

M. Balasubramanian, H. S. Lee, X. Sun, X. Q. Yang, A. R. Moodenbaugh, J. McBreen, D. A. Fischer, Z. Fu

Emerging and Solid-State Batteries

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Abstract

The formation of a solid electrolyte interface (SEI) in LiNi_0.85Co_0.15O₂ cathodes from lithium-ion cells cycled a and 70°C was observed and characterized using soft X-ray absorption spectroscopy (XAS). XAS measurements were made in the energy region between 500 and 950 eV, encompassing the Ni and Co L₃- and L₂-edges and at the K-edges of O and F. Measurements, obtained in the total electron yield mode, are surface sensitive, probing to a depthof ∼5 nm. XAS at the F K-edge demonstrates the presence of poly(vinylidene fluoride) (PVdF) in addition to LiF on the surface of cycled electrodes. The results indicate that the PVdF in the cycled electrodes in largely intact and that the LiF comes from decomposition of LiPF₆ from the electrolyte. XAS also suggests Fe contamination of cycled cathodes.

Original language	English
Pages (from-to)	A22-A25
Journal	Electrochemical and Solid-State Letters
Volume	5
Issue number	1
DOIs	https://doi.org/10.1149/1.1423802
State	Published - Jan 2002

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title = "Formation of SEI on cycled lithium-ion battery cathodes soft X-ray absorption study",

abstract = "The formation of a solid electrolyte interface (SEI) in LiNi0.85Co0.15O2 cathodes from lithium-ion cells cycled a and 70°C was observed and characterized using soft X-ray absorption spectroscopy (XAS). XAS measurements were made in the energy region between 500 and 950 eV, encompassing the Ni and Co L3- and L2-edges and at the K-edges of O and F. Measurements, obtained in the total electron yield mode, are surface sensitive, probing to a depthof ∼5 nm. XAS at the F K-edge demonstrates the presence of poly(vinylidene fluoride) (PVdF) in addition to LiF on the surface of cycled electrodes. The results indicate that the PVdF in the cycled electrodes in largely intact and that the LiF comes from decomposition of LiPF6 from the electrolyte. XAS also suggests Fe contamination of cycled cathodes.",

author = "M. Balasubramanian and Lee, {H. S.} and X. Sun and Yang, {X. Q.} and Moodenbaugh, {A. R.} and J. McBreen and Fischer, {D. A.} and Z. Fu",

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doi = "10.1149/1.1423802",

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T1 - Formation of SEI on cycled lithium-ion battery cathodes soft X-ray absorption study

AU - Balasubramanian, M.

AU - Lee, H. S.

AU - Sun, X.

AU - Yang, X. Q.

AU - Moodenbaugh, A. R.

AU - McBreen, J.

AU - Fischer, D. A.

AU - Fu, Z.

PY - 2002/1

Y1 - 2002/1

N2 - The formation of a solid electrolyte interface (SEI) in LiNi0.85Co0.15O2 cathodes from lithium-ion cells cycled a and 70°C was observed and characterized using soft X-ray absorption spectroscopy (XAS). XAS measurements were made in the energy region between 500 and 950 eV, encompassing the Ni and Co L3- and L2-edges and at the K-edges of O and F. Measurements, obtained in the total electron yield mode, are surface sensitive, probing to a depthof ∼5 nm. XAS at the F K-edge demonstrates the presence of poly(vinylidene fluoride) (PVdF) in addition to LiF on the surface of cycled electrodes. The results indicate that the PVdF in the cycled electrodes in largely intact and that the LiF comes from decomposition of LiPF6 from the electrolyte. XAS also suggests Fe contamination of cycled cathodes.

AB - The formation of a solid electrolyte interface (SEI) in LiNi0.85Co0.15O2 cathodes from lithium-ion cells cycled a and 70°C was observed and characterized using soft X-ray absorption spectroscopy (XAS). XAS measurements were made in the energy region between 500 and 950 eV, encompassing the Ni and Co L3- and L2-edges and at the K-edges of O and F. Measurements, obtained in the total electron yield mode, are surface sensitive, probing to a depthof ∼5 nm. XAS at the F K-edge demonstrates the presence of poly(vinylidene fluoride) (PVdF) in addition to LiF on the surface of cycled electrodes. The results indicate that the PVdF in the cycled electrodes in largely intact and that the LiF comes from decomposition of LiPF6 from the electrolyte. XAS also suggests Fe contamination of cycled cathodes.

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DO - 10.1149/1.1423802

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VL - 5

SP - A22-A25

JO - Electrochemical and Solid-State Letters

JF - Electrochemical and Solid-State Letters

IS - 1

ER -

Formation of SEI on cycled lithium-ion battery cathodes soft X-ray absorption study

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