Battery (electricity)

Sodium

Quantum mechanics

Engineering

Chemical physics

Polymer chemistry

Electrochemistry

Pseudocapacitance

Metallurgy

Materials science

Power (physics)

Chemical engineering

Carbodiimide

Substrate (aquarium)

Geology

Oceanography

Physical chemistry

Supercapacitor

Thermodynamics

Physics

Nanotechnology

Organic chemistry

Diffusion

Crystallite

Kinetics

Charge (physics)

Chemistry

Electrode

ACS Nano

Iron carbodiimide (FeNCN) belongs to a type of metal compounds with a more covalent bonding structure compared to common transition metal oxides. It could provide possibilities for various structural designs with improved charge-transfer kinetics in battery systems. Moreover, these possibilities are still highly expected for promoting enhancement in rate performance of sodium (Na)-ion battery. Herein, oriented FeNCN crystallites were grown on the carbon-based substrate with exposed {010} faces along the [001] direction (O-FeNCN/S). It provides a high Na-ion storage capacity with excellent rate capability (680 mAh g–1 at 0.2 A g–1 and 360 mAh g–1 at 20 A g–1), presenting rapid charge-transfer kinetics with high contribution of pseudocapacitance during a typical conversion reaction. This high rate performance is attributed to the oriented morphology of FeNCN crystallites. Its orientation along [001] maintains preferred Na-ion diffusion along the two directions in the entire morphology of O-FeNCN/S, supporting fast Na-ion storage kinetics during the charge/discharge process. This study could provide ideas toward the understanding of the rational structural design of metal carbodiimides for attaining high electrochemical performance in future.

Realizing Fast Charge Diffusion in Oriented Iron Carbodiimide Structure for High-Rate Sodium-Ion Storage Performance