Journal
JOURNAL OF POWER SOURCES
Volume 265, Issue -, Pages 81-90Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.04.115
Keywords
Lithium-ion batteries; Capillary suspension; Electrode processing; Slurry viscosity; Flow properties
Funding
- Heinrich Boll foundation
- state Baden-Wuerttemberg
- Competence-E project at KIT
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A novel slurry concept for the fabrication of Li-ion battery electrodes focusing on water based formulations is presented. Taking advantage of capillary forces inferred by adding a small fraction of a second fluid immiscible with the bulk continuous phase the low shear viscosity can be varied in a wide range without conventional polymeric rheology control agents disturbing the electric properties of the dry electrode. The new slurries provide superior storage stability and excellent shape accuracy of the final dry film. This reduces waste cut-off at the edges and increases the density of active ingredients, thus improving cost-efficiency. The viscosity at high shear rates remains unaffected, thus the slurries can be processed and coated using established equipment and process parameters. Adhesion to the conductor foil and electrochemical properties of the electrode layers and corresponding cells are similar to those made from conventional slurries. (C) 2014 Elsevier B.V. All rights reserved.
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