Semi‐Dry Extrusion‐Based Processing for Graphite Anodes: Morphological Insights and Electrochemical Performance

Author:

Wiegmann Eike12ORCID,Cavers Heather12,Diener Alexander12,Kwade Arno12

Affiliation:

1. Institute for Particle Technology Technische Universität Braunschweig Volkmaroder Str. 5 38104 Braunschweig Germany

2. Battery LabFactory Braunschweig (BLB) Technische Universität Braunschweig Langer Kamp 8 38106 Braunschweig Germany

Abstract

To improve the sustainability of large‐scale battery production, it is important to find affordable, energy‐efficient processing strategies. Additionally, to achieve electrochemical performances with good rate capability and cycling stability, it is important to understand the link between the processing strategy and the resulting anode morphology. Herein, a novel, low‐solvent, extrusion‐based strategy is employed for the production of graphite anodes. Furthermore, a comparative analysis is conducted between semi‐dry processed electrodes and conventionally manufactured anodes, focusing on structural parameters such as parameter distribution, ionic resistances, and rate capability. Besides, various screw configurations are employed during the semi‐dry process, and it is observed that higher energy input during mixing resulted in an increase in the surface area of the anode. Moreover, it is noted that an increased surface area correlated with enhanced rate capability during cycling. This finding highlights the advantages of employing low‐solvent, extrusion‐based processing methods. Nevertheless, excessively high surface areas lead to an increase in the electrolyte/electrode interface area, resulting in the formation of an undesirable solid–electrolyte interphase that hampers discharge capacity and cycling stability. Hence, it is crucial to strike a balance between the electrode's microstructure, including particle structures, and its electrochemical performance.

Funder

Bundesministerium für Bildung und Forschung

Publisher

Wiley

Subject

General Energy

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