Ni/Co-Olivine Cathode Project
Phospho-olivines are interesting cathode materials for Li-ion batteries, which promise higher energy density due to their high capacity and operation voltages as well as improved safety attributed to their thermal stability.
The present project deals with the synthesis, characterization, electrode development and cell testing of phosphor-olivine cathode materials and cells for Li-ion batteries. This project is done in collaboration with Prof. Hubert Gasteiger heading the research area Technical electrochemistry and industrial partners and combines of two parts:
I) Material synthesis and physicochemical characterization, mainly carried out our group.
II) Material evaluation via electrochemical methods carried out in Prof. Gasteigers group.
Today ion conductors play a key role in high-technology devices like solid state batteries, chemical sensors, solar cells or solid oxide fuel cells. Within the SFB 458 "Ionenbewegung in Materialien mit ungeordneten Strukturen- vom Elementarschritt zum makroskopischen Transport" the development of ion conducting materials and the understanding of the transport phenomena of these materials are of great interest. We focus our research activities on the synthesis and characterisation of new ion conducting copper, silver and lithium compounds as well as the optimisation of present ion conducting materials by chemical modification of the non mobile part of the structures. A wide range of analytic, spectroscopic and diffraction methods will be applied to the materials in order to get a detailed insight in the chemical and physical properties. Starting with the crystal structure determination and the determination of the electrical properties we try to optimise the materials in terms of long time stability, conductivity and polymorphism. Various methods like DSC (Differential scanning calorimetry), DTA (Differential thermal analysis) are used to get detailed information about the thermal properties. Spectroscopic methods like IR and Raman spectroscopy and solid state NMR techniques are additional applications to support the optimisation process.