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  4. Insights into the buffer effect observed in blended lithium insertion electrodes
 
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2017
Journal Article
Titel

Insights into the buffer effect observed in blended lithium insertion electrodes

Abstract
Blending of lithium insertion compounds is a promising approach to design advanced electrodes for lithium-ion batteries. In spite of considerable improvements regarding the power density, the basic interactions between the constituents of the blend are still under discussion. Herein we quantify the so-called buffer effect observed in blended insertion electrodes for the first time by using a special experimental setup and a model-like blended insertion electrode. Internal dynamics of the blend are investigated during defined pulse loads and subsequent relaxation. The results reveal significant electrochemical interactions between the constituents, depending on the applied current and the overpotential, respectively. These interactions are attributed to thermodynamic factors of emerging and converging equilibrium potentials of the constituents during charging-discharging and subsequent relaxation. This buffer effect enables the preparation of electrodes with high energy density and very good rate capability by combining active materials with high specific capacity and fast kinetics.
Author(s)
Heubner, Christian
TU Dresden, IFWW
Liebmann, Tobias
Fraunhofer-Institut fĂĽr Keramische Technologien und Systeme IKTS
Lämmel, Christoph
Fraunhofer-Institut fĂĽr Keramische Technologien und Systeme IKTS
Schneider, Michael
Fraunhofer-Institut fĂĽr Keramische Technologien und Systeme IKTS
Michaelis, Alexander
TU Dresden, IFWW/ Fraunhofer IKTS
Zeitschrift
Journal of power sources
Thumbnail Image
DOI
10.1016/j.jpowsour.2017.07.108
Language
English
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Fraunhofer-Institut fĂĽr Keramische Technologien und Systeme IKTS
Tags
  • Blended electrode

  • discharging

  • pulse

  • relaxation

  • buffer effect

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