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Spray‐coated Hard Carbon Composite Anodes for Sodium‐Ion Insertion

Palanisamy, Krishnaveni; Daboss, Sven; Schäfer, David; Rohnke, Marcus; Derr, Laurin ORCID iD icon 1; Lang, Marcel 1,2; Schuster, Rolf 1; Kranz, Christine
1 Institut für Physikalische Chemie (IPC), Karlsruher Institut für Technologie (KIT)
2 Institut für Produktentwicklung (IPEK), Karlsruher Institut für Technologie (KIT)

Abstract:

Sodium-ion batteries are among the most promising alternatives to lithium-ion batteries. Hard carbon (HC) electrodes have been recognized as suitable active anode material for mono-valent ion batteries. Here, we present a simple and cost-effective spray-coating process to prepare HC composite electrodes on copper current collectors with different binder (sodium carboxymethyl cellulose, CMC) content and different HC particle sizes. The spray-coated electrodes were evaluated and tested in 1 M sodium perchlorate (NaClO4) in propylene carbonate (PC) in dependence of the CMC content with and without fluoroethylene carbonate (FEC) as additive, and the performance was also compared to doctor bladed HC electrodes. Spray-coated anodes in Na half-cells revealed improved capacity during the first cycles compared with doctor bladed anodes with similar thicknesses. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) studies were performed, which revealed a significant increase of inorganic fluoro-compounds in the formed solid electrolyte interphase (SEI) when FEC was present as additive. In addition, first single electrode microcalorimetry studies on spray-coated thin HC composite electrodes yielded an entropy of the sodiation process of 80 J mol1 K1 at high state of charge (SoC), comparable to that of bulk Na deposition.

Zugehörige Institution(en) am KIT Institut für Physikalische Chemie (IPC)
Institut für Produktentwicklung (IPEK)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2024
Sprache Englisch
Identifikator ISSN: 2566-6223
KITopen-ID: 1000164813
Erschienen in Batteries and Supercaps
Verlag John Wiley and Sons
Band 7
Heft 1
Seiten Art.-Nr.: e202300402
Vorab online veröffentlicht am 14.11.2023
Nachgewiesen in OpenAlex
Dimensions
Scopus
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie

Verlagsausgabe §
DOI: 10.5445/IR/1000164813
Veröffentlicht am 23.11.2023
Originalveröffentlichung
DOI: 10.1002/batt.202300402
Scopus
Zitationen: 4
Web of Science
Zitationen: 3
Dimensions
Zitationen: 5
Seitenaufrufe: 75
seit 23.11.2023
Downloads: 58
seit 28.11.2023
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