Abstract
Sodium-deficient nickel–manganese oxides with a layered type of structure are, nowadays, of great interest as electrode materials for both lithium- and sodium-ion batteries since they are able to intercalate lithium and sodium ions reversibly within a broad concentration range. Herein, we report new data on the effects of the particle sizes and of the electrolyte salt on the intercalation properties of Na2/3Ni0.5Mn0.5O2 with a P3-type of structure. The morphology of layered Na2/3Ni0.5Mn0.5O2 oxides has been varied by changing the type of the precursor used: from Na–Ni–Mn acetates to Na–Ni–Mn mixed nitrate acetates. The structure, particle dimensions, and particle size distribution of oxides have been determined by means of powder X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light-scattering measurements, and X-ray photoelectron spectroscopy (XPS). The intercalation properties of Na2/3Ni0.5Mn0.5O2 have been studied in model electrochemical cells versus Li metal as the anode. We ...
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