Co<sub>3</sub>O<sub>4</sub>‑Induced Na<sub>2</sub>CO<sub>3</sub>‑Rich SEI Film on an FeNCN Electrode\nwith Promoted Loading and High-Rate Na-Storage Performance

Iron\ncarbodiimide (FeNCN) often suffers from unstable interfacial\nstructure with an unexpected failure of Na-ion storage performance.\nIn this work, Co<sub>3</sub>O<sub>4</sub> particles were deposited\non the surface of FeNCN. This Co<sub>3</sub>O<sub>4</sub> nanolayer\nled to the formation of a Na<sub>2</sub>CO<sub>3</sub>-rich inorganic\ncomponent SEI film to enhance the stability of a promoted-loading\nFeNCN electrode interface with fast Na<sup>+</sup> migration pathway.\nBenefitting from this strategy, the FeNCN electrode could present\na capacity retention rate of 99.95% per cycle after 1500 cycles at\n1 A g<sup>–1</sup>. The design of interfacial structure in\na promoted-loading electrode could be a reference for stable and high-rate\nperformance of carbodiimide-based materials.