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	Synthesis and characterization of LiN/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/ as cathode materials for Li-ion batteries
	Jiangang Li ; Li Wang ; Qian Zhang ; Xiangming He
	2010-10-12 ; 2010-10-12
关键词	Experimental/ cathodes cobalt alloys differential scanning calorimetry electrochemical electrodes lithium compounds manganese compounds nickel compounds niobium compounds scanning electron microscopy secondary cells X-ray diffraction X-ray photoelectron spectra/ cathode materials Li-ion batteries X-ray diffraction XRD scanning electron microscope SEM X-ray photoelectron spectroscopy XPS differential scanning calorimetric charge-discharge test voltage 4.3 V temperature 255 degC temperature 850 degC LiN/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/ LiNi/sub 0.6/Co/sub x/Mn/sub 0.4-x/O/sub 2/ LiNi/sub 0.6/Co/sub 0.05/Mn/sub 0.35/O/sub 2/ Li/ A8630F Secondary cells A8245 Electrochemistry and electrophoresis B8410E Secondary cells/ voltage 4.3E+00 V temperature 5.2815E+02 K temperature 1.12315E+03 K/ LiN0.6MnCoO2/int N0.6/int O2/int Co/int Li/int Mn/int N/int O/int LiN0.6MnCoO2/ss N0.6/ss O2/ss Co/ss Li/ss Mn/ss N/ss O/ss LiNi0.6CoMnO2/int Ni0.6/int O2/int Co/int Li/int Mn/int Ni/int O/int LiNi0.6CoMnO2/ss Ni0.6/ss O2/ss Co/ss Li/ss Mn/ss Ni/ss O/ss LiNi0.6Co0.05Mn0.35O2/int Co0.05/int Mn0.35/int Ni0.6/int O2/int Co/int Li/int Mn/int Ni/int O/int LiNi0.6Co0.05Mn0.35O2/ss Co0.05/ss Mn0.35/ss Ni0.6/ss O2/ss Co/ss Li/ss Mn/ss Ni/ss O/ss Li/int Li/el
中文摘要	LiNi/sub 0.6/Co/sub x/Mn/sub 0.4//sub -//sub x/O/sub 2/ ( x = 0.05, 0.10, 0.15, 0.2) cathode materials are prepared, and their structural and electrochemical properties are investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetric (DSC) and charge-discharge test. The results show that well-ordering layered LiNi/sub 0.6/Co/sub x/Mn/sub 0.4//sub -//sub x/O/sub 2/ ( x = 0.05, 0.10, 0.15, 0.2) cathode materials are successfully prepared in air at 850 degrees C. The increase of the Co content in LiNi/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/ leads to the acceleration of the grain growth, the increase of the initial discharge capacity and the deterioration of the cycling performance of LiNi/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/. It also leads to the enhancement of the ratio Ni/sup 3+//Ni/sup 2+/ in LiNi/sub 0.6/Co/sub x/Mn/sub 0.4-x/O/sub 2/, which is approved by the XPS analysis, resulting in the increase of the phase transition during cycling. This is speculated to be main reason for the deteriotion of the cycling performance. All synthesized LiNi/sub 0.6/Co/sub x/Mn/sub 0.4-x/O/sub 2/ samples charged at 4.3 V show exothermic peaks with an onset temperature of larger than 255 degrees C, and give out less than 400 Jg/sup -1/ of total heat flow associated with the peaks in DSC analysis profile, exhibiting better thermal stability. LiNi/sub 0.6/Co/sub 0.05/Mn/sub 0.35/O/sub 2/ with low Co content and good thermal stability presents a capacity of 156.6 mAhg/sup -1/ and 98.5% of initial capacity retention after 50 cycles, showing to be a promising cathode materials for Li-ion batteries.[All rights reserved Elsevier].
语种	英语
出版者	Elsevier Sequoia S.A ; Switzerland
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79298]
专题	清华大学
推荐引用方式 GB/T 7714	Jiangang Li,Li Wang,Qian Zhang,et al. Synthesis and characterization of LiN/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/ as cathode materials for Li-ion batteries[J],2010, 2010.
APA	Jiangang Li,Li Wang,Qian Zhang,&Xiangming He.(2010).Synthesis and characterization of LiN/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/ as cathode materials for Li-ion batteries..
MLA	Jiangang Li,et al."Synthesis and characterization of LiN/sub 0.6/Mn/sub 0.4-x/Co/sub x/O/sub 2/ as cathode materials for Li-ion batteries".(2010).

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