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

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 für Keramische Technologien und Systeme IKTS  
Lämmel, Christoph
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Schneider, Michael  
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Michaelis, Alexander
TU Dresden, IFWW
Journal
Journal of power sources  
DOI
10.1016/j.jpowsour.2017.07.108
Language
English
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Keyword(s)
  • Blended electrode

  • discharging

  • pulse

  • relaxation

  • buffer effect

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