Recyclable Fluorine‐Free Water‐Borne Binders for High‐Energy Lithium‐Ion Battery Cathodes

Author:

Leibetseder Felix1ORCID,Xie Jingyu2,Leeb Elisabeth3ORCID,Hesser Günter4,Pettinger Karl‐Heinz2,Bretterbauer Klaus1ORCID

Affiliation:

1. Institute for Chemical Technology of Organic Materials Johannes Kepler University Linz Altenbergerstraße 69 Linz 4040 Austria

2. Technology Centre for Energy Landshut University of Applied Sciences Wiesenweg 1 94099 Ruhstorf an der Rott Germany

3. Institute of Physical Chemistry and Linz Institute for Organic Solar Cells (LIOS) Johannes Kepler University Linz Altenbergerstraße 69 Linz 4040 Austria

4. Center for Surface and Nanoanalytics Johannes Kepler University Linz Altenbergerstraße 69 Linz 4040 Austria

Abstract

AbstractThe rapidly increasing demand for lithium‐ion batteries and the fight against climate change call for novel materials that enhance performance, enable eco‐friendly processing, and are designed for efficient recycling. In lithium‐ion batteries, the binder polymer, used for cathode production, constitutes an integral but often overlooked component. The currently used polyvinylidene fluoride is processed with toxic organic solvents and has numerous other disadvantages concerning adhesion, conductivity, and recyclability. A change to aqueous processing using new, multi‐functional, purpose‐built materials that are soluble in water and fluorine‐free would thus constitute an important advance in the battery sector. Herein, four water‐soluble surfactant‐like polymers based on 11‐aminoundecanoic acid, that can be obtained in high purity and at a multigram scale are described. Free radical polymerization allows modification of the polymer with a wide variety of comonomers. The materials presented significantly enhance adhesion, are thermally stable at temperatures up to 350 °C, and are compatible with state‐of‐the‐art high‐energy LiNi0.6Mn0.2Co0.2O2 (NMC 622) cathode materials. It is also shown new recycling pathways made possible by the reversible pH‐dependent water‐solubility of the materials.

Publisher

Wiley

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