Three-dimensional porous microspheres comprising hollow Fe2O3 nanorods/CNT building blocks with superior electrochemical performance for lithium ion batteries. Issue 23 (6th June 2018)

• Record Type: Journal Article
• Authors: Park, Seung-Keun; Park, Gi Dae; Kang, Yun Chan
• Is Part Of: Nanoscale. Volume 10:Issue 23(2018)
• Page Start: 11150
• Page End: 11157
• Publication Date: 2018-06-06
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr02686f
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Three-dimensional hollow Fe2 O3 nanorod/CNT microspheres for lithium ion batteries were successfully prepared by a novel strategy. Abstract : It is highly desirable to develop anode materials with rational architectures for lithium ion batteries to achieve high-performance electrochemical properties. In this study, three-dimensional porous composite microspheres comprising hollow Fe2 O3 nanorods/carbon nanotube (CNT) building blocks are successfully constructed by direct deposition and further thermal transformation of beta-FeOOH nanorods on CNT porous microspheres. The CNT porous microsphere, which is prepared by a spray pyrolysis, provides ample sites for the direct growth of beta-FeOOH nanorods. During the further oxidation process, the beta-FeOOH nanorods are transformed into hollow Fe2 O3 nanorods as a result of dehydroxylation and lattice shrinkage, resulting in the formation of hollow Fe2 O3 nanorods/CNT porous microspheres. Such a hierarchical structure of composite microspheres not only facilitates electrolyte accessibility but also offers conductive networks for electrons during electrochemical reactions. Accordingly, the electrodes exhibit a high discharge capacity of 1307 mA h g −1 after 300 cycles at a current density of 1 A g −1 ; this is associated with an excellent capacity retention of 84%, which is calculated from the initial cycle. In addition, the composite delivers a discharge capacity of 703 mA h g −1 at a current density of 15 A g −1 .