High capacity, low cobalt-containing cathode materials for LIBs

High capacity, low cobalt-containing cathode materials for LIBs

Presenter: Dr. Pekka Tynjälä
Title: High capacity, low cobalt-containing cathode materials for LIBs
Affiliation: University of Oulu

Abstract

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.

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pekkatynjala
Pekka Tynjälä has an academic background in catalytic chemistry and catalytic materials. For about last 10 years he have been working at the University of Oulu as a post-doctoral researcher. His main research interest has been in the hydrometallurgical processes, like chemical precipitation and leaching processes, carried out in a close collaboration with the chemical industry.

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