Journal
ACS NANO
Volume 15, Issue 4, Pages 6410-6419Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c08314
Keywords
iron carbodiimide; oriented growth; sodium-ion storage; sodium-ion diffusion; rate performance
Categories
Funding
- National Natural Science Foundation of China [52073166, 51702198]
- Postdoctoral Foundation of China [155660, 2016M592897XB]
- Young Scientific Star Foundation of Shaanxi Province [2020KJXX-081]
- Natural Science Foundation of Shaanxi Province Ministry of Education [19JK0137]
- Xi'an Key Laboratory of Green Manufacture of Ceramic Materials Foundation [2019220214SYS017CG039]
- Key Program for International S&T Cooperation Projects of Shaanxi Province [2020KW-038, 2020GHJD-04]
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Iron carbodiimide demonstrates improved charge-transfer kinetics and high rate performance in sodium-ion battery due to its covalent bonding structure. The oriented FeNCN crystallites exhibit rapid charge-transfer kinetics and high Na-ion storage capacity, providing ideas for rational structural design of metal carbodiimides for future high electrochemical performance.
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.
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