Article

Li electroactivity of iron (II) tungstate nanorods.

Department of Materials Science and Engineering, Ajou University, Suwon, Korea.
Nanotechnology (impact factor: 3.98). 10/2010; 21(46):465602. DOI:10.1088/0957-4484/21/46/465602 pp.465602
Source: PubMed

ABSTRACT We herein report the first application of a divalent iron tungstate (FeWO(4)) nanostructured material, with a wolframite structure, to a Li-ion battery anode. The FeWO(4) nanospheres and nanorods were synthesized at 180 °C without any surfactants or templates via a facile hydrothermal process by simply adjusting the pH. The resulting nanopowders were characterized using x-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and Brunauer-Emmett-Teller (BET) measurements. Furthermore, we evaluated the Li electroactivity of the FeWO(4) nanorods using cyclic voltammetry and observed that their reversible capacity was over 500 mAh g(-1) after 20 cycles, which proved much higher than that of graphite-based anodes.

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Keywords

20 cycles
 
Brunauer-Emmett-Teller
 
cyclic voltammetry
 
divalent iron tungstate
 
field-emission scanning electron microscopy
 
first application
 
graphite-based anodes
 
high-resolution transmission electron microscopy
 
nanorods
 
resulting nanopowders
 
wolframite structure
 
x-ray diffraction