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Semi-empirical master curve concept describing the rate capability of lithium insertion electrodes

 
: Heubner, Christian; Seeba, Jann; Liebmann, Tobias; Nickol, Alexander; Börner, Stefan; Fritsch, Marco; Nikolowski, Kristian; Wolter, M.; Schneider, Michael; Michaelis, Alexander

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Journal of power sources 380 (2018), S.83-91
ISSN: 0378-7753
ISSN: 1873-2755
Bundesministerium für Bildung und Forschung BMBF
Batterie2020; 03XP0070B; HiLo
Englisch
Zeitschriftenaufsatz
Fraunhofer IKTS ()
lithium; battery; rate capability; fast discharge; master curve; model

Abstract
A simple semi-empirical master curve concept, describing the rate capability of porous insertion electrodes for lithium-ion batteries, is proposed. The model based on the evaluation of the time constants of lithium diffusion in the liquid electrolyte and the solid active material. This theoretical approach is successfully verified by comprehensive experimental investigations of the rate capability of a large number of porous insertion electrodes with varying active materials and design parameters. It turns out, that the rate capability of all investigated electrodes follows a simple master curve governed by the time constant of the rate limiting process. We demonstrate that the master curve concept can be used to determine optimum design criteria meeting specific requirements in terms of maximum gravimetric capacity for a desired rate capability. The model further reveals practical limits of the electrode design, attesting the empirically well-known and inevitable tradeoff between energy and power density.

: http://publica.fraunhofer.de/dokumente/N-506503.html