In situ growth and performance of spherical Fe sub(2)F sub(5).H sub(2)O nanoparticles in multi-walled carbon nanotube network matrix as cathode material for sodium ion batteries

The multi-wall carbon nanotubes wired spherical Fe sub(2)F sub(5).H sub(2)O particles (MWCNTs-wired Fe sub(2)F sub(5).H sub(2)O) are synthesized via an ionic liquid (IL) based precipitation route as the cathode material for sodium ion batteries (SIBs), in which the IL 1-butyl-2,3-dimethylimidazolium...

Full description

Saved in:
Bibliographic Details
Published in:Journal of power sources 2016-06, Vol.316, p.170-175
Main Authors: Jiang, Miaoling, Wang, Xianyou, Hu, Hai, Wei, Shuangying, Fu, Yanqing, Shen, Yongqiang
Format: Article
Language:English
Subjects:
Cathodes
Current density
Discharge
Electric batteries
Multi wall carbon nanotubes
Scanning electron microscopy
Sodium
Transmission electron microscopy
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The multi-wall carbon nanotubes wired spherical Fe sub(2)F sub(5).H sub(2)O particles (MWCNTs-wired Fe sub(2)F sub(5).H sub(2)O) are synthesized via an ionic liquid (IL) based precipitation route as the cathode material for sodium ion batteries (SIBs), in which the IL 1-butyl-2,3-dimethylimidazolium tetrafluoroborate (BMMimBF sub(4)) is used as environmentally friendly fluorine source, appropriate solvent and binder. The structure, morphology and electrochemical performance of the as-prepared samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), charge/discharge tests, cyclic voltammetric measurements (CV). The results show that the MWCNTs-wired spherical Fe sub(2)F sub(5).H sub(2)O particles present the cubic crystal structure with the cell volume of 1.12821 nm super(3). Moreover, the SEM and TEM images show that the spherical Fe sub(2)F sub(5).H sub(2)O particles and disentangled MWCNTs are intertwined together to form a chestnut-like micrometer-sized aggregates. Furthermore, the MWCNTs-wired spherical Fe sub(2)F sub(5).H sub(2)O particles show a high initial discharge capacity of 251.2 mAh g super(-1) at 20 mA g super(-1) in the voltage of 1.0-4.0 V, and the corresponding reversible discharge capacity is 197.4 mAh g super(-1). Comparing with bare Fe sub(2)F sub(5).H sub(2)O, the discharge capacity of the MWCNTs-wired spherical Fe sub(2)F sub(5).H sub(2)O particles still can maintain about 115.0 mAh g super(-1) after 50 cycles when the current density increased to 100 mA g super(-1), and the corresponding capacity retention reaches 90.2%.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2016.03.007