Hua, Weibo ; Wang, Suning ; Wang, Kai ; Missyul, Alexander ; Fu, Qiang ; Dewi Darma, Mariyam Susana ; Li, Hang ; Baran, Volodymyr ; Liu, Laijun ; Kübel, Christian ; Binder, Joachim R. ; Knapp, Michael ; Ehrenberg, Helmut ; Indris, Sylvio (2021)
Li+/Na+ ion exchange in layered Na2/3(Ni0.25Mn0.75)O2: a simple and fast way to synthesize O3/O2-type layered oxides.
In: Chemistry of Materials, 33 (14)
doi: 10.1021/acs.chemmater.1c00962
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Normally, high temperatures are required for solid-state reactions to overcome energy barriers in the formation of lithium insertion materials. Consequently, conventional high-temperature lithiation reactions are very time- and energy-consuming and often accompanied by undesirable side reactions. Thus, how to synthesize Li-containing cathode materials with a desired structure under a short reaction time and low temperature is of paramount significance. Herein, layered sodium-deficient Na-2/3 square (1/3)(Ni0.25Mn0.75)O-2 (square for vacancy) oxides with different oxygen stackings (P2 or P3 structure) were deployed in lithium ion batteries. An interesting Li+/Na+ ionexchange reaction between the electrode material and LiPF6-based carbonate electrolyte was observed at room temperature for the first time. Such a reaction can produce the layered Li-2/3 square(1/3)(Ni0.25Mn0.75)O-2 compounds having the O2 or O3 structure, which show the ability to reversibly accommodate lithium ions over a relatively wide voltage range. Our experiments may open up a pathway toward the development of novel electrode materials.

Frage zum Eintrag

Redaktionelle Details anzeigen