Additive Influence on Binder Migration in Electrode Drying

Energy Technology, vol. 12

Abstract

Two main goals for the industrial, slurry‐based electrode processing are a high process speed and the maximum possible material efficiency. This makes an increased drying rate and active material share favorable, but both are limited by adverse effects on the electrode quality. The adverse effects of fast drying are associated with the migration of binder. In this article, the slurry properties of water‐based graphite slurries are manipulated using a synthetic, layered silicate as additive. The influence of the polymer‐particle composite network on the viscosity, adhesion strength, and cell performance is investigated. By addition of a small amount of additive (0.5 wt% of the dry electrode), the binder migration is mitigated up to a drying rate of 6 g m−2 s−1 for graphite anodes with ≈4.2 mAh cm−2 (corresponding with 30 s drying time) leading to a possible increase of eight times the process speed compared to drying with 0.75 g m−2 s−1 if adverse effects on the tortuosity of the electrodes can be solved. In this work, a combination of additive usage is pointed out with a multilayer approach and first insights are provided in how the binder migration may be mitigated to gain structurally optimized fast‐dried electrodes without losses in electrode quality.

Authors 9

1. David Burger corresponding

   Karlsruhe Institute of Technology

   Affiliation as printed

   Thin Film Technology (TFT) Karlsruhe Institute of Technology (KIT) Straße am Forum 7 D‐76131 Karlsruhe Germany

2. Julian Klemens

   Karlsruhe Institute of Technology

   Affiliation as printed

   Thin Film Technology (TFT) Karlsruhe Institute of Technology (KIT) Straße am Forum 7 D‐76131 Karlsruhe Germany

3. Noah Keim

   Karlsruhe Institute of Technology

   Affiliation as printed

   Institute for Applied Materials (IAM) – Energy Storage Systems (ESS) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 D‐76144 Eggenstein‐Leopoldshafen Germany

4. Marcus Müller

   Karlsruhe Institute of Technology

   Affiliation as printed

   Institute for Applied Materials (IAM) – Energy Storage Systems (ESS) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 D‐76144 Eggenstein‐Leopoldshafen Germany

5. Werner Bauer

   Karlsruhe Institute of Technology

   Affiliation as printed

   Institute for Applied Materials (IAM) – Energy Storage Systems (ESS) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 D‐76144 Eggenstein‐Leopoldshafen Germany

6. Joyce Schmatz Aachen

   Microstructure and Pores

   Affiliation as printed

   MaP – Microstructure and Pores GmbH Junkerstraße 93 D‐52064 Aachen Germany

7. Jana Kumberg

   Karlsruhe Institute of Technology

   Affiliation as printed

   Thin Film Technology (TFT) Karlsruhe Institute of Technology (KIT) Straße am Forum 7 D‐76131 Karlsruhe Germany

8. Philip Scharfer

   Karlsruhe Institute of Technology

   Affiliation as printed

   Thin Film Technology (TFT) Karlsruhe Institute of Technology (KIT) Straße am Forum 7 D‐76131 Karlsruhe Germany

9. Wilhelm Schabel

   Karlsruhe Institute of Technology

   Affiliation as printed

   Thin Film Technology (TFT) Karlsruhe Institute of Technology (KIT) Straße am Forum 7 D‐76131 Karlsruhe Germany