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Deriving Structure-Performance Relations of Chemically Modified Chitosan Binders for Sustainable High-Voltage LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$ Cathodes

Kuenzel, Matthias; Porhiel, Regis; Bresser, Dominic; Asenbauer, Jakob; Axmann, Peter; Wohlfahrt‐Mehrens, Margret; Passerini, Stefano

The implementation of aqueous electrode processing for lithium‐ion positive electrodes is key towards the realization of environmentally benign and cheap battery production. One of the water‐soluble binders that has attracted most attention is chitosan, the second‐most abundant natural biopolymer. Herein, the use of chitosan for high‐voltage, cobalt‐free LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$ cathodes is reported for the first time. A detailed comparison of three different grades of chitosan with varying chain length and degrees of deacetylation (DD) is provided to explore the impact of these properties on the electrochemical performance. In fact, bio‐derived chitosan with a relatively lower DD outperforms synthetic chitosan‐especially after crosslinking with citric acid‐yielding about 10 % higher capacities. Higher molecular weight appears additionally advantageous for the cycling stability. Finally, guar gum is employed as slurry thickener, co‐crosslinking with chitosan. This allows for achieving 50 % higher mass loadings than for chitosan only and stable capacities above 130 and 120 mAh g$^{-1}$ at C/3 and 1 C, respectively.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129496
Veröffentlicht am 08.02.2021
DOI: 10.1002/batt.201900140
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Young Investigator Network (YIN)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2020
Sprache Englisch
Identifikator ISSN: 2566-6223, 2566-6223
KITopen-ID: 1000129496
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Batteries & supercaps
Verlag Wiley
Band 3
Heft 2
Seiten 155–164
Vorab online veröffentlicht am 23.10.2019
Nachgewiesen in Dimensions
Web of Science
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