Presenter: Katja Lahtinen
Title: Post mortem analysis of stoichiometric, over-lithiated and doped LiCoO2 electrode materials for Li-ion batteries
Affiliation: Aalto University
Lithium cobalt oxide (LiCoO2, LCO) is one of the most used materials in Li-ion batteries for portable applications. However, the consumption of Li-ion batteries is quickly increasing and as a result, the availability of the raw materials and the amount of waste batteries is increasing rapidly. Therefore, recycling of the used battery materials is an important factor to investigate. In this work, stoichiometric, over-lithiated and Mg-Ti doped LCOs prepared using the same precursors and synthesis method are aged in LCO/graphite pouch cells, and their aging behaviour is investigated and compared. The cells are then opened, the electrodes are collected, and assembled to half-cells. The LCOs are relithiated and their reuse is investigated. The results indicate that the capacity loss is caused by structural changes and loss of lithium. The Mg-Ti doped LCO withstands the changes the best because of a stabilized structure and an enhanced conductivity. Therefore it shows promising reusability.