Solid Electrolyte Interphase (SEI) of Water-Processed Graphite Electrodes Examined in a 65 mAh Full Cell Configuration

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Jeschull, FabianUppsala universitet,Strukturkemi (author)

Solid Electrolyte Interphase (SEI) of Water-Processed Graphite Electrodes Examined in a 65 mAh Full Cell Configuration

Article/chapterEnglish2018

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2018-09-18
American Chemical Society (ACS),2018
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LIBRIS-ID:oai:DiVA.org:uu-368482
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-368482URI
https://doi.org/10.1021/acsaem.8b00608DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

Notes

Electrode binders, such as sodium carboxymethyl cellulose (CMC-Na), styrene–butadiene rubber (SBR) and poly(sodium acrylate) (PAA-Na) are commonly applied binder materials for the manufacture of electrodes from aqueous slurries. Their processability in water has considerable advantages over slurries based on N-methylpyrrolidone (NMP) considering toxicity, environment and production costs. In this study, water-processed graphite electrodes containing either CMC-Na:SBR, PAA-Na, or CMC-Na:PAA-Na as binders have been prepared on a pilot scale, cycled in graphite||LiFePO4 Li-ion battery cells and analyzed post-mortem with respect to the binder impact on the SEI composition, using in-house (1486.6 eV) and synchrotron-based (2300 eV) photoelectron spectroscopy (PES). The estimated SEI layer thickness was smaller than 11 nm for all samples and decreased in the order: PAA-Na > CMC-Na:SBR > CMC-Na:PAA-Na. The SEI thickness correlates with the surface concentration of CMC-Na, for example, the CMC-Na:PAA-Na mixture showed signs of polymer depletion of the PAA-Na component. The SEI layer components are largely comparable to those formed on a conventional graphite:poly(vinylidene difluoride) (PVdF) electrode. However, the SEI is complemented, by notable amounts of carboxylates and alkoxides, whose formation is favored in water-based negative electrodes. Additionally, more electrolyte salt degradation is observed in formulations comprising PAA-Na. The choice of the binder for the negative electrode had little impact on the surface layer formed on the LiFePO4 positive electrode, except for different contents of sodium salt deposits, as a result of ion migration from the counter electrode.

Subject headings and genre

NATURVETENSKAP Kemi Materialkemi hsv//swe
NATURAL SCIENCES Chemical Sciences Materials Chemistry hsv//eng
CMC-Na; graphite; HAXPES; Li-ion battery; PAA; XPS

Added entries (persons, corporate bodies, meetings, titles ...)

Maibach, JuliaUppsala universitet,Strukturkemi(Swepub:uu)julma188 (author)
Félix, R.Renewable Energy, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany (author)
Wohlfahrt-Mehrens, M.Zentrum für Solarenergie- und Wasserstoff-Forschung (ZSW), Lise-Meitner-Straße 24, 89081 Ulm, Germany (author)
Edström, Kristina,Professor,1958-Uppsala universitet,Strukturkemi(Swepub:uu)ked02526 (author)
Memm, M.Zentrum für Solarenergie- und Wasserstoff-Forschung (ZSW), Lise-Meitner-Straße 24, 89081 Ulm, Germany (author)
Brandell, Daniel,1975-Uppsala universitet,Strukturkemi(Swepub:uu)dbr10334 (author)
Uppsala universitetStrukturkemi (creator_code:org_t)

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In:ACS Applied Energy Materials: American Chemical Society (ACS)1:10, s. 5176-51882574-0962

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