Correlation between structure and electrochemistry of LiMO2 cathode materials (M = Ni, Co)

Grosu, Cristina (2017) Correlation between structure and electrochemistry of LiMO2 cathode materials (M = Ni, Co). [Laurea magistrale], Università di Bologna, Corso di Studio in Chimica industriale [LM-DM270]
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Technical diversity and various knowledge is required for the understanding of undoubtedly complex system such as a Lithium-ion battery. The peculiarity is to combine different techniques that allow a complete investigation while the battery is working. Nowadays, research on Li-ion batteries (LIBs) is experiencing an exponential growth in the development of new cathode materials. Accordingly, Li-rich and Ni-rich NMCs, which have similar layered structure of LiMO2 oxides, have been recently proposed. Despite the promising performance on them, still a lot of issues have to be resolved and the materials need a more in depth characterisation for further commercial applications. In this study LiMO2 material, in particular M = Co and Ni, will be presented. We have focused on the synthesis of pure LiCoO2 and LiNiO2 at first, followed by the mixed LiNi0.5Co0.5O2. Different ways of synthesis were investigated for LCO but the sol-gel-water method showed the best performances. An accurate and systematic structural characterization followed by the appropriate electrochemical tests were done. Moreover, the in situ techniques (in-situ XRD and in situ OEMS) allowed a deep investigation in the structural change and gas evolution upon the electrochemically driven processes.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Grosu, Cristina
Relatore della tesi
Correlatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
Li-ion batteries cathode material in situ techniques XRD sol gel synthesis
Data di discussione della Tesi
24 Marzo 2017

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