Investigations on the Effective Electric Loads in Blended Insertion Electrodes for Lithium-Ion Batteries

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Tobias Liebmann - , Fraunhofer Institute for Ceramic Technologies and Systems (Author)
  • Christian Heubner - , Chair of Inorganic Non-Metallic Materials, Fraunhofer Institute for Ceramic Technologies and Systems (Author)
  • Christoph Lämmel - , Fraunhofer Institute for Ceramic Technologies and Systems (Author)
  • Michael Schneider - , Fraunhofer Institute for Ceramic Technologies and Systems (Author)
  • Alexander Michaelis - , Chair of Inorganic Non-Metallic Materials, Fraunhofer Institute for Ceramic Technologies and Systems (Author)

Abstract

Blending different types of active materials in one electrode is a great opportunity to improve the overall performance of lithium-ion batteries. Despite considerable progress in the recent years, basic interactions, such as the specific impact of a single component on the blends’ properties, are not satisfactorily understood at the moment. In this study, the electric loads of the individual components of a blend are investigated using a special experimental setup in combination with model-like blended electrodes. Systematic studies on the impact of type and mass fraction of the components are conducted for different nominal charge and discharge rates. The experiments reveal that the single components can be charged and discharged independent from each other, according to their characteristic redox activities and the overpotential during operation. This can lead to high effective electric loads (C-rates) subjected to a single component despite a comparatively low total current applied to the electrode. Based on the experimental results, a simple model is developed to estimate maximum effective C-rates of the individual components in an arbitrary blend system. These novel insights are discussed in regarding advantages and disadvantages of battery electrodes with multiple active materials.

Details

Original languageEnglish
Pages (from-to)5728-5734
Number of pages7
JournalChemElectroChem
Volume6
Issue number22
Publication statusPublished - 18 Nov 2019
Peer-reviewedYes

Keywords

Sustainable Development Goals

ASJC Scopus subject areas

Keywords

  • blended electrodes, C-rate, electric load, insertion, Li-ion battery