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Nondestructive Depth Profiling of the Solid Electrolyte Interphase on LiFePO4 and Graphite Electrodes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
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2010 (English)In: ECS Transactions, ISSN 1938-5862, E-ISSN 1938-6737, Vol. 25, no 36, 121-127 p.Article in journal (Refereed) Published
Abstract [en]

This study describes a method for non-destructive depth profiling of the electrode/electrolyte interphase in lithium-ion batteries. Photoelectron spectroscopy (PES) measurements using four different excitation energies in the 175 - 6900 eVrange from two synchrotron sources (MAXlab and BESSY) was conductedon the surface of cycled LiFePO4 and graphite electrodes. Thus the surfaces were probed at four different depths in the1-15 nm range without using sputtering, which is advantageous since sputtering has been shown to change the surface chemical composition.The results of this study suggest that the solid electrolyteinterphase (SEI) on the cathode side, in addition to some salt products, also consists of some oxidized electrode components, while the SEI on the anode side mainly consists of solvent decomposition products, as expected. Finally, it is noted that wewith this method can "see through the SEI layer" into the bulk also on the anode side.

Place, publisher, year, edition, pages
The Electrochemical Society , 2010. Vol. 25, no 36, 121-127 p.
National Category
Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-139516OAI: oai:DiVA.org:uu-139516DiVA: diva2:381504
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2017-12-11Bibliographically approved

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http://dx.doi.org/10.1149/1.3393856

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Malmgren, SaraRensmo, HåkanGustafsson, TorbjörnEdström, Kristina

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