In Situ Construction of "Anchor‐Like" Structures in FeNCN for Long Cyclic Life in Sodium‐Ion Batteries. (26th February 2020)

• Record Type: Journal Article
• Authors: Guo, Penghui; Cao, Liyun; Wang, Rong; Hu, Yunfei; Xu, Zhanwei; Huang, Jianfeng; Yao, Chunyan; Guo, Ling; Cheng, Yayi; Li, Jiayin; Kajiyoshi, Koji
• Is Part Of: Advanced functional materials. Volume 30:Number 17(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-02-26
• Subjects: composite structures -- iron carbodiimides -- pyrolytic synthesis -- sodium‐ion batteries; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202000208
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Iron carbodiimide (FeNCN) is a high‐reactivity anode material for sodium‐ion batteries. However, strict synthesis technology and poor electrochemical stability limit its application. FeNCN polyhedrons are prepared using a facile one‐step pyrolysis process. In these polyhedrons, many "anchor‐like" structures are in situ constructed with FeC bonds. These FeC bonds connect the FeNCN polyhedrons closely. The FeNCN polyhedrons with "anchor‐like" structures exhibit good electrochemical stability, that is, high capacity retention of 79.9% (408 mAh g −1 ) at 0.5 A g −1 after 300 cycles. Further analysis suggests that the FeC bond plays an important role to improve the structural stability of FeNCN polyhedrons. The "anchor‐like" structures with FeC bonds can hold FeNCN polyhedrons closely when Na + intercalates, avoiding structural breakage with obvious capacity loss. This work provides a novel synthesis technology of FeNCN and helps related researcher to deepen the understanding of this material, as well as provide inspirations as to improving the electrochemical stability of related materials. Abstract : Iron carbodiimide (FeNCN) polyhedrons are prepared using a facile one‐step pyrolysis approach. In FeNCN polyhedrons, "anchor‐like" structures with FeC bonds are in situ constructed. FeC bonds on "anchor‐like" structures significantly promote the structural stability of FeNCN polyhedron. This FeNCN polyhedron with "anchor‐like" structure exhibits excellent capacity of Na + storage.