Abstract
In order to find efficient barrier materials and inert dopants for the high temperature processing of Li-ion battery cathode materials, a chemical stability of Li1+x (Ni,Mn)O2 at 900 °C in air in contact with Al2O3, Nb2O5, SnO2, TiO2, and CeO2 is studied. The interaction of Li1+x (Ni,Mn)O2 with Al2O3, Nb2O5, and SnO2 results in the formation of the corresponding complex oxides—LiAlO2, Li3NbO4, and Li2SnO3. A first stage of the chemical degradation of Li1+x (Ni,Mn)O2 is usually accompanied by the transformation of its hexagonal crystal structure into the cubic one. The reaction of Li1+x (Ni,Mn)O2 with titania is accompanied by the disappearance of TiO2 and the formation of the Li1+x (Ni,Mn)O2-based solid solution. XRD analysis confirmed the absence of chemical interaction of Li1+x (Ni,Mn)O2 with CeO2 while SEM data demonstrated the absence of eutectic melting at 900 °C. The similar absence of traces of the high temperature chemical interaction with Li1+x (Ni,Mn)O2 is found also for LiAlO2, Li3NbO4, and Li2SnO3. Galvanostatic and cyclic voltammetry studies of Li1+x (Ni,Mn,Co)O2–CeO2 composites demonstrated the increase in the initial discharge capacity of the composite cathodes compared to the native Li1+x (Ni,Mn,Co)O2.
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This study is supported by the Russian Foundation for Basic Research, grant No. 14-08-31644 mol_a. Kind help and fruitful discussions of Dr. O.A. Brylev (MSU) are gratefully acknowledged.
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Kurilenko, K.A., Gorbunov, D.V. & Shlyakhtin, O.A. Interaction of Li1+x (Ni,Mn,Co)O2 cathode materials with single and complex oxides at 900 °C. Ionics 22, 601–607 (2016). https://doi.org/10.1007/s11581-015-1581-1
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DOI: https://doi.org/10.1007/s11581-015-1581-1