Inhaltspezifische Aktionen

Mai

Bild des Monats Mai 2018

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Stabilizing the electrochemical deposition and dissolution for zinc anodes

Zinc-based secondary batteries, especially zinc-air batteries, are promising candidates as energy storage device for electronic applications. They appeal due to their high specific energy density, environment friendliness and safe operation. However, the zinc anode suffers from limited cycling stability arising from the high solubility of oxidized zinc species in the alkaline electrolyte. This results in the so called shape change of the electrode and in loss of active material during cycling.

In the BMBF-project Zisabi (in cooperation with Prof. Abe, Kyoto University, Japan) we investigate the influence of a homogeneous coating with an anion-exchange ionomer on top of the zinc anode to confine the oxidized zinc species. In a recent publication we demonstrated that our concept (see schematic drawing) helps to confine oxidized zinc species as zinc oxide interlayer, evidenced by electrochemical analysis, morphology analysis via scanning electron microscopy and X-ray photoelectron spectroscopy depth-profiling. The coating applied keeps the active material as close as possible to its place of origin, reduces the electrode shape change and stabilizes the electrochemical deposition and dissolution processes at the zinc anode.

In a collaboration with the group of Prof. Dr. Derck Schlettwein, we are now working on the transfer of this concept to an applied zinc anode using a multitude of electronic conductive host structures that are covered with active material (shown in the scanning electron micrograph).

Publication: Stock D. et al., “Homogeneous Coating with an Anion-Exchange Ionomer Improves the Cycling Stability of Secondary Batteries with Zinc Anodes”, ACS Appl. Mater. Interfaces. 10 (2018) 8640–8648. doi: https://doi.org/10.1021/acsami.7b18623

Dieses Bild wurde eingereicht von Daniel Stock, AG Dr. Daniel Schröder.