Encapsulating highly crystallized mesoporous Fe3O4 in hollow N-doped carbon nanospheres for high-capacity long-life sodium-ion batteries. (February 2019)

• Record Type: Journal Article
• Authors: Zhao, Yujuan; Wang, Faxing; Wang, Chun; Wang, Shuai; Wang, Changyao; Zhao, Zaiwang; Duan, Linlin; Liu, Yupu; Wu, Yuping; Li, Wei; Zhao, Dongyuan
• Is Part Of: Nano energy. Volume 56(2019)
• Page Start: 426
• Page End: 433
• Publication Date: 2019-02
• Subjects: Mesoporous -- Fe3O4 -- Sodium-ion battery; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2018.11.040
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: High capacity transition metal oxides have attracted much attention as potential sodium-ion batteries (SIBs) anodes. However, the fast capacity fading greatly limits their practical applications. In this study, highly crystallized mesoporous Fe3 O4 nanoparticles encapsulated in the hollow nitrogen-doped carbon nanospheres (denoted as HCM-Fe3 O4 @void@N-C) have been synthesized and then explored as anode materials for SIBs. The resultant HCM-Fe3 O4 @void@N-C nanospheres possess a uniform particle size of ~ 180 nm with highly crystallized mesoporous Fe3 O4 cores (~ 100 nm in diameter), a large surface area of ~ 250 m 2 g −1 and a nitrogen-doped carbon shell (~ 7.6 wt%). Notably, a high discharge capacity of 372 mA h g −1 is obtained after the first five cycles at 160 mA g −1, which can gradually increase and be maintained at an ultrahigh specific capacity of 522 mA h g −1 even after 800 cycles. Besides, remarkable rate performance with a capacity of 196 mA h g −1 at a current density of 1200 mA g –1 and a high Coulombic efficiency (~ 100%) are obtained. Such good performance can be attributed to the unique yolk-shell nanostructure with a high crystallized mesoporous Fe3 O4 core, a high conductive N-doped carbon shell, and a suitable void space, paving a new way to design and synthesize high-performance anode materials for SIBs. Graphical abstract: Highlights: Highly Crystallized Mesoporous Fe3 O4 in hollow N-doped Carbon Nanospheres (HCM-Fe3 O4 @void@N-C) were obtained. HCM-Fe3 O4 @void@N-C were synthesized via successive sol–gel coating methods combining with confinement calcination strategy. Sodium-ion battery with long life and high capacity were demonstrated.