Presenter: Dr. Pekka Tynjälä
Title: High capacity, low cobalt-containing cathode materials for LIBs
Affiliation: University of Oulu
This study aimed the development of high capacity, high nickel-containing and low cobalt-containing cathode materials (LiNixCoyMe1-x-yO2, x ≥ 0.8-1.0). These materials typically have high energy densities (>200 mAh/g) but suffer from low thermal stability and capacity fading during the cycling. Mixed transition metal hydroxide precursors were prepared with chemical co-precipitation followed by lithiation. Cathode materials were modified by coating and doping in order to improve the chemical and thermal stability and to prevent the capacity fading. Cathode materials were characterized by FESEM (morphology), tap density, powder XRD (crystalline phases), XPS, Raman and ICP-OES or AAS (metal content). Electrochemical measurements were carried out in a galvanostatic charge/discharge cycling using coin cells with lithium metal as anode or pouch cells with graphite anode. Based on the results, modified cathode materials showed high energy density (>200 mAh/g) and good cyclability.