Abstract:

Two-dimensional layered Ca₂N was synthesized via a pyrolysis method with Ca₃N₂ precursor. The component, structure and morphology of Ca₂N were characterized by X-ray diffraction and scanning electron microscope. As a novel anode material of sodium ion batteries, the initial discharge capacity is up to 584 mA·h/g and the reversible capacity is about 180 mA·h/g at a current density of 50 mA/g. Even at a high current density of 2000 mA/g, a capacity of 70 mA·h/g can be retained.

Key words: dicalcium nitride, two-dimensional layered structure, sodium ion batteries, anode material