Hollow Iron Oxide Nanoparticles
for Application in
Lithium Ion Batteries
- Publication date
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Abstract
Material design in terms of their morphologies other
than solid
nanoparticles can lead to more advanced properties. At the example
of iron oxide, we explored the electrochemical properties of hollow
nanoparticles with an application as a cathode and anode. Such nanoparticles
contain very high concentration of cation vacancies that can be efficiently
utilized for reversible Li ion intercalation without structural change.
Cycling in high voltage range results in high capacity (∼132
mAh/g at 2.5 V), 99.7% Coulombic efficiency, superior rate performance
(133 mAh/g at 3000 mA/g) and excellent stability (no fading at fast
rate during more than 500 cycles). Cation vacancies in hollow iron
oxide nanoparticles are also found to be responsible for the enhanced
capacity in the conversion reactions. We monitored in situ structural
transformation of hollow iron oxide nanoparticles by synchrotron X-ray
absorption and diffraction techniques that provided us clear understanding
of the lithium intercalation processes during electrochemical cycling