Fe3N constrained inside C nanocages as an anode for Li-ion batteries through post-synthesis nitridation
Abstract Carbon-constraint Fe 3 N nanoparticles (Fe 3 N@C) with a unique core-shell structure are successfully realized through a facile 2-step process: fabricating Fe@C core-shell nanoparticles by DC arc-discharge method and subsequently converting them into Fe 3 N@C through chemical nitriding reactions. A series of technological conditions are carried out to manipulate the core components and the shell structure. Owing to the protection of carbon shell, the nanoparticles own clear morphology and fine dispersion without distinct sintering. The Fe 3 N@C nanoparticles are applied as the anode material for lithium-ion batteries and exhibit high electric capacity in long-term cyclic charge/discharge process. Their excellent performance comes from the electrochemical lithiation/delithiation reactivity of the Fe 3 N core, while stable nanostructure of the electrodes sustained in the long cycles benefits from the constraint of carbon shell mostly. Highlights Carbon-constraint Fe 3 N nanoparticles were realized by a facile 2-step process. First-principle calculation was carried out to clarify the reactions of Fe 3 N. The ion migration at interfaces was detected by an impedance measurement. Graphical abstract [DISPLAY OMISSION]
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