Please use this identifier to cite or link to this item:
|Title:||Structural evolution and the capacity fade mechanism upon long-term cycling in Li-rich cathode material|
|Citation:||Song, B., Liu, Z., Lai, M.O., Lu, L. (2012-10-05). Structural evolution and the capacity fade mechanism upon long-term cycling in Li-rich cathode material. Physical Chemistry Chemical Physics 14 (37) : 12875-12883. ScholarBank@NUS Repository. https://doi.org/10.1039/c2cp42068f|
|Abstract:||High capacity Li-rich layered cathode Li(Li 0.2Mn 0.54Ni 0.13Co 0.13)O 2 and doped one are investigated to understand mechanisms of capacity fade as well as voltage decrease upon long-term cycling. Detailed electrochemical analysis reveals a phase-separation-like behavior with increase in the cycle number, which is responsible for gradual reduction in discharge voltage. X-ray photoelectron spectroscopy (XPS), transmission electron microscope coupled with energy dispersive X-ray spectroscopy (TEM-EDS) and inductively coupled plasma emission spectrometry (ICP) analysis results show increase in valence of transition metals on the surface of powder at a fully discharged state in addition to surface dissolution of Ni, leading to rapid capacity loss. High resolution transmission electron microscopy (HR-TEM) shows a phase transformation from original layered structure into spinel-like nano-domains in local structure. Though such an unexpected structural change is unfavorable because of lower output voltage, it is observed to be beneficial for high-rate performance. © 2012 the Owner Societies.|
|Source Title:||Physical Chemistry Chemical Physics|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 14, 2018
WEB OF SCIENCETM
checked on Jun 20, 2018
checked on Jun 29, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.