Synthesis and Electrochemical Behavior of Nanostructured Copper Particles on Graphite for Application in Lithium Ion Batteries

Björn Karl Licht 1 , Fabian Homeyer 1 , Katharina Bösebeck 2 , Michael Binnewies,  and Paul Heitjans
  • 1 Leibniz Universität Hannover, Institut für Anorganische Chemie, Callinstr. 9, 30167 Hannover, Germany
  • 2 Leibniz Universität Hannover, Institut für Physikalische Chemie und Elektrochemie, Callinstr. 3–3a, 30167 Hannover, Germany
  • 3 Leibniz Universität Hannover, ZFM – Zentrum für Festkörperchemie und Neue Materialien, Callinstr. 3–3a, 30167 Hannover, Germany

Abstract

Graphitic materials are currently the state-of-the-art anode materials for lithium ion secondary batteries. By chemical modification, the electrochemical performance of the pristine materials can be improved. In this paper we report on the preparation of nanostructured copper particles on graphite by thermal decomposition of copper formate. With this technique a novel, simple and low cost method for a homogeneous deposition of nanostructured copper particles on graphite was established. Different amounts of copper were realized and their influence on the electrochemical behavior of the active material was investigated. The copper particles had a size distribution between 50 nm and 300 nm. Electrochemical measurements displayed an improved performance of the synthesized composite material compared to the pristine material. Cyclic voltammetry showed a suppressed cointercalation of solvated lithium and an increased formation of the solid electrolyte interphase (SEI). Battery cycling demonstrated an increased discharge capacity and cycling stability.

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Founded in 1887, the Zeitschrift für Physikalische Chemie covers the main developments in physical chemistry, placing with an emphasis on experimental research. It represents a combination ofdiscusses reaction kinetics and spectroscopy, surface research and electrochemistry, thermodynamics and the structure analysis of matter in its various conditions, among other topics.

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