A novel slurry concept for the fabrication of lithium-ion battery electrodes with beneficial properties

JOURNAL OF POWER SOURCES

卷:265

Article

Bitsch, Boris¹  Dittmann, Jens¹  Schmitt, Marcel²  Schaffer, Philip²  Schabel, Wilhelm²  Willenbacher, Norbert¹ 

[1] Karlsruhe Inst Technol, Inst Mech Proc Engn & Mech, D-76131 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, Inst Thermal Proc Engn, D-76131 Karlsruhe, Germany

关键词: Lithium-ion batteries;    Capillary suspension;    Electrode processing;    Slurry viscosity;    Flow properties;   

DOI  :  10.1016/j.jpowsour.2014.04.115

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free