November 2013The technical equipment of the working group has been complemented with a lab calender. The calender is a system of at least two rollers for compressing and smoothing electrodes. Calendering is already being applied as a standard procedure in battery manufacturing to improve energy and power densities as well as mechanical, physical and electrochemical properties of electrode materials. The figure shows the calender with two heatable rollers and SEM images of a calendered and a non-calendered CuO electrode. Compressing the electrode with a pressure of about 1300 bar reduces the volume and the porosity. By doing so, the density increases and the conductivity and connectivity between the active material, additives and the current collector improve with the result that the cycle life is prolonged. The calender runs with an operating gas pressure of 2 bar to 8.25 bar. Furthermore, the rollers can be heated up to 120 °C and rotated with a velocity up to 8.3 rmp. (Picture submitted by Franziska Klein.)https://www.uni-giessen.de/en/faculties/f08/departments/physchem/janek/gallerypotm/pom2013/november-2013/viewhttps://www.uni-giessen.de/@@site-logo/logo.png
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November 2013
The technical equipment of the working group has been complemented with a lab calender. The calender is a system of at least two rollers for compressing and smoothing electrodes. Calendering is already being applied as a standard procedure in battery manufacturing to improve energy and power densities as well as mechanical, physical and electrochemical properties of electrode materials. The figure shows the calender with two heatable rollers and SEM images of a calendered and a non-calendered CuO electrode. Compressing the electrode with a pressure of about 1300 bar reduces the volume and the porosity. By doing so, the density increases and the conductivity and connectivity between the active material, additives and the current collector improve with the result that the cycle life is prolonged. The calender runs with an operating gas pressure of 2 bar to 8.25 bar. Furthermore, the rollers can be heated up to 120 °C and rotated with a velocity up to 8.3 rmp. (Picture submitted by Franziska Klein.)
