High-Performance Na-O Batteries Enabled by Oriented NaO Nanowires as Discharge Products.

Na-O batteries are emerging rechargeable batteries due to their high theoretical energy density and abundant resources, but they suffer from sluggish kinetics due to the formation of large-size discharge products with cubic or irregular particle shapes. Here, we report the unique growth of discharge products of NaO nanowires inside Na-O batteries that significantly boosts the performance of Na-O batteries. For this purpose, a high-spin CoO electrocatalyst was synthesized via the high-temperature oxidation of pure cobalt nanoparticles in an external magnetic field.