XPS Karaktärisering för Nickel-rika Katod Material

Tidsperiod: 2019-08-01 till 2019-10-31

Projektledare: Reza Younesi

Finansiär: Vetenskapsrådet

Bidragstyp: Oklassificerat

Budget: 61 533 SEK

The goal of the project is to employ X-ray Photoelectron Spectroscopy (XPS) to aid in the understanding of processes occurring on the surface of novel high-energy electrode materials in Li-ion batteries. Ångstrm Laboratory at Uppsala University in Sweden is the birthplace of XPS and has world-renowned facilities for accomplishing this project. Using these facilities and the expertise of the scientists at Uppsala University, cathodes that have exhibited extraordinary capacities will be studied with XPS to probe their stability during the first charge-discharge cycle.Improvements in cathode materials provide a promising opportunity for increasing the energy density of lithium ion batteries. The Fellow is currently researching novel Li-rich cathode materials made of transition metal-doped lithium oxides as well as layered transition metal oxides (Nickel, Manganese and Cobalt) that show high capacities via the phenomenon of anion redox, wherein the oxide anions (formally O2-) are redox-active. Their high capacity is, however, known to fade after the first charge-discharge cycle, suggesting significant changes in the bulk and/or at the interface with the electrolyte solution. This project focuses on understanding the mechanism of anionic redox and interfacial degradation as a function of the state of charge and discharge in these novel materials.