Preparation and characterization of LiMn 2O 4 cathodes surface-modified by DC pulsed plasma treatment
Journal
Journal of the Chinese Chemical Society
Journal Volume
59
Journal Issue
10
Pages
1258-1263
Date Issued
2012
Author(s)
Abstract
Abstract A study of oxygen dc pulsed plasma irradiation treatment has been carried out on LiMn 2 O 4 powder cathodes to enhance the electrochemical performances of lithium ion batteries. The samples have been characterized by X‐ray diffraction, scanning electron microscope, energy dispersion spectroscope and electrochemical measurements. It is found that after undergoing the plasma treatments, the sharp facets of LiMn 2 O 4 particles become smooth due to plasma ion bombardment. The treated electrodes are partially covered by layers with high atomic percent of element F, indicating the reflow of binders. The electrochemical measurements are carried out under harsh conditions, including deep‐discharge at low cut‐off potential of 2 V and cycling at elevated temperature of 60 °C. The results reveal that moderate oxygen dc pulsed plasma treatment can improve the cycling stability of LiMn 2 O 4 powder electrodes in the above mentioned conditions. The enhanced electrochemical performances are attributed to the dense protection layers on electrode surface, which reduce the capacity fading due to the Mn +2 ions dissolution.
SDGs
Type
journal article