期刊
JOURNAL OF POWER SOURCES
卷 325, 期 -, 页码 620-629出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.056
关键词
Nickel-rich layered oxide; Lithium-rich layered oxide; Surface chemical stability; Pouch-type full cell
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy [DE-EE0006447]
- Welch Foundation [F-1254]
- DOE's Office of Biological and Environmental Research
- Department of Energy [DE-AC05-76RLO1830]
A facile synthesis method has been developed to prepare xLi(2)MnO(3)center dot(1-x)LiNi0.7Co0.5Mn0.15O2 (x = 0, 0.03, 0.07, 0.10, 0.20, and 0.30) cathode materials, combining the advantages of the high specific capacity of the Ni-rich layered phase and the surface chemical stability of the Li-rich layered phase. X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical charge/discharge measurements confirm the formation of a Li-rich layered phase with C2/m symmetry. The high-angle annular dark-field (HAADF) scanning transmission electron microscopy (STEM) reveals a spatial relationship that the Li-rich nano-domain islands are integrated into the conventional Ni-rich layered matrix (R (3) over barm). Most importantly, this is the first time that Li-rich phase has been directly observed inside a particle at the nano-scale, when the overall composition of the layered oxide Li1+delta Ni1-y-z-delta MnyMzO2 (M = metal) is Ni-rich (>0.5) rather than Mn-rich (>0.5). Remarkably, the xLi(2)MnO(3)center dot(1-x)LiNi0.7Co0.15Mn0.15O2 cathodes with optimized x value shows superior electrochemical performance at C/3 rate: an initial capacity of 190 mA h g(-1) with 90% capacity retention after 400 cycles in a half cell and 73.5% capacity retention after 900 cycles in a pouch-type full cell. (C) 2016 Elsevier B.V. All rights reserved.
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