Using ion transport studies to elucidate the defect chemistry of Zn-conducting spinel-structured oxides

• Applicants: Professor Roger De Souza, Ph.D.; Dr. Kerstin Neuhaus
• Subject Area: Synthesis and Properties of Functional Materials
• Term: since 2026
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 573589769

In order to meet the increasing demand for stationary energy storage associated with the energy transition, research has recently focused increasingly on alternatives to lithium-ion batteries (LIB), which promise a higher energy density with cheaper starting materials and more environmentally friendly manufacturing processes. In this context, oxide materials with a spinel structure (AB2O4) such as ZnMn2O4 have repeatedly been discussed as interesting active materials for the positive electrode in zinc-ion batteries (ZIB) or zinc-metal batteries (ZMB). The present project aims to derive a doping strategy to improve the transport properties of spinel materials based on ZnMn2O4 or ZnFe2O4. Both anion and cation doping options will be investigated. The focus will be on the effects of doping on ionic and electronic transport as well as chemical and structural stability during insertion/de-insertion of Zn2+. An important goal will be the development of a quantitative point defect model. To this end, a combination of theoretical and various experimental methods will be used to characterize zinc ion diffusion, a combination made possible by the close cooperation between the two groups. The investigations at material level will be accompanied by electrochemical investigations at cell level.

• DFG Programme: Research Grants