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Electrolyte-cathode interactions in 5-V lithium-ion cells
AIT Austrian Institute of Technology, Austria.
AIT Austrian Institute of Technology, Austria.
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.ORCID iD: 0000-0001-8775-0602
AIT Austrian Institute of Technology, Austria.
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2017 (English)In: Journal of Solid State Electrochemistry, ISSN 1432-8488, E-ISSN 1433-0768Article in journal (Refereed) In press
Abstract [en]

The electrolyte/electrode interactions on the anode side of a lithium-ion cell and the formation of the solid electrolyte interphase (SEI) have been investigated intensively in the past and are fairly well understood. Present knowledge about the reactions on the cathode side and the resulting cathode electrolyte interphase (CEI) is less detailed. In this study, the electrolyte/electrode interactions on the surface of the high-voltage cathode material LiNi0.5Mn1.5O4 (LNMO), both bare and FePO4-coated, were investigated. The gases evolving upon first time charging of the system were investigated using a GC/MS combination. The degradation products included THF, dimethyl peroxide, phosphor trifluoride, 1,3-dioxolane and dimethyl difluor silane, formed in the GC’s column as its coating reacts with HF from the experiments. Although these substances and their formation are in themselves interesting, the absence of many degradation products which have been mentioned in the existing literature is of equal interest. Our results clearly indicate that coating a cathode material can have a major influence on the amount and composition of the gaseous decomposition products in the formation phase. © 2017 The Author(s)

Place, publisher, year, edition, pages
2017.
Keywords [en]
Cathodes, Coatings, Degradation, Electrodes, Lithium-ion batteries, Solid electrolytes, Cath-ode materials, Decomposition products, Degradation products, Electrolyte cathode, High voltage cathode, LiNi0.5Mn1.5O4, Lithium-ion cells, Solid electrolyte interphase, Electrolytes
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Natural Sciences
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URN: urn:nbn:se:ri:diva-30818DOI: 10.1007/s10008-017-3701-5Scopus ID: 2-s2.0-85027182399OAI: oai:DiVA.org:ri-30818DiVA, id: diva2:1138690
Available from: 2017-09-06 Created: 2017-09-06 Last updated: 2018-07-06Bibliographically approved

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Ahniyaz, Anwar

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