Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.20: Poster

Tuesday, March 17, 2020, 18:15–20:00, P4

Optimization of structural and electrochemical properties of LiNiO₂ thin film cathodes — •Juri J.E. Becker, Fabian Michel, Hendrik Hemmelmann, Angelika Polity, and Matthias T. Elm — Center for Materials Research, Gießen, Germany

Due to its higher energy density layered lithium-nickel(III)-oxide (LNO) is a possible alternative to lithium cobalt oxide, which is used as cathode material in lithium-ion batteries (LIBs). However, LNO suffers from thermal instability as well as the fact that Ni²⁺-ions have the tendency to substitute Li⁺-ions during delithiation. To investigate the structural and electrochemical properties of LNO in more detail, thin films were prepared as model electrodes using radio frequency magnetron sputtering. For this purpose, a LNO target was pressed and thin films were deposited on a c-sapphire|platinum substrate. The influence of the growth temperature on the structural properties during the sputtering process was examined. At higher temperatures the crystallinity of LNO is increased which allows a better lithium-ion diffusion during the intercalation process. Pouch-cells were built using the deposited cathodes. Electrochemical measurements with a potentiostat reveal phase transitions occuring during the cycling process.