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Title: Structural evolution and the capacity fade mechanism upon long-term cycling in Li-rich cathode material
Authors: Song, B.
Liu, Z.
Lai, M.O. 
Lu, L. 
Issue Date: 5-Oct-2012
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.
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
ISSN: 14639076
DOI: 10.1039/c2cp42068f
Appears in Collections:Staff Publications

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