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21 January 2014

Electrode processing using carboxymethylcellulose (CMC) as aqueous binder by WWU and TIMCAL published in Journal of Power Sources

Manufacturing of CMC-based electrodes with successful aqueous processing of water-sensible NMC cathode material achieved by the University of Muenster within their electrode formulation tasks in GREENLION has been published in two recent articles in Journal of Power Sources.

The first manuscript [1] reports on the manufacturing and characterization of CMC, sodium carboxymethylcellulose-based, Li-ion positive electrodes with high active material mass loadings using only water as a solvent. Calendering effect on the electrodes and performance of balanced full Li-ion cells in pouch cell configuration is investigated.

On the second manuscript [2], a novel approach to enable aqueous binders is reported. Producing NMC electrodes using CMC as a binder and water as a solvent results in serious aluminum corrosion during electrode manufacturing due to the high pH of the slurry. In order to prevent the direct contact of the corrosive slurry with aluminum foil, the latter is first coated with a thin carbon layer. This solution provides electrodes able to deliver comparable capacity to polyvinylidene-di-fluoride (PVdF)-based electrode having the same composition.

[1] N. Loeffler, J. v. Zamory, N. Laszczynski, I. Doberdo, G.-T. Kim, S. Passerini, (2014): Performance of LiNi1/3Mn1/3Co1/3O2 / graphite batteries based on aqueous binder. In: Journal of Power Sources, 248, 915-922. http://dx.doi.org/10.1016/j.jpowsour.2013.10.018

[2] I. Doberdo, N. Loeffler, N. Laszczynski, D. Cericola, N. Penazzi, S. Bodoardo, G.-T. Kim, S. Passerini, (2014): Enabling aqueous binders for lithium battery cathodes – Carbon coating of aluminum current collector. In: Journal of Power Sources, 248, 1000-1006. http://dx.doi.org/10.1016/j.jpowsour.2013.10.039