Improving the electrochemical performance of Li-rich Li1.2Ni0.2Mn0.6O2 by using Ni-Mn oxide surface modification

doi:10.1016/j.jpowsour.2018.04.034

	Improving the electrochemical performance of Li-rich Li1.2Ni0.2Mn0.6O2 by using Ni-Mn oxide surface modification
	Ding, Xiang ; Xiao, Li-Na ; Li, Yi-Xuan ; Tang, Zhong-Feng ; Wan, Jia-Wei ; Wen, Zhao-Yin ; Chen, Chun-Hua
刊名	JOURNAL OF POWER SOURCES
	2018
卷号	390 页码:13
关键词	Li-rich cathode Surface modification Cycling stability Rate capability Energy efficiency
ISSN号	0378-7753
DOI	10.1016/j.jpowsour.2018.04.034
英文摘要	The surface lithium residues on Li-rich layered cathode materials xLi(2)MnO(3)center dot(1-x)LiMO2 (M = Mn, Co, Ni, etc.) are harmful to their electrochemical properties. In this work, the surface lithium residues of Li-rich Li2.2Ni0.2Mn0.6O2 (LNMO) are identified as Li2CO3 and LiOH by Fourier transform IR for the first time. To overcome this issue, Ni/Mn acetates are used to react with the surface lithium residues to form a LiNi0.5Mn1.5O4 spinel coating layer on LNMO particles. Compared with the bare LNMO sample, the 1 wt% LiNi0.5Mn1.5O4 coated LNMO shows improved long-term cycling stability and rate capability both at room temperature and 55 degrees C. The coated one delivers an initial discharge capacity of 236 mAh g(-1) with 99.6% capacity retention after 100 cycles at 0.5 C, while it is only 230 mAh g(-1) with 91% capacity retention for the bare LNMO. After the surface modification, the rate capacity increases from 155 mAh g(-1) to 180 mAh g(-1) at 5 C at room temperature while the energy efficiency is improved from 78% to 85%.
学科主题	Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Materials Science, Multidisciplinary
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000434748000002
资助机构	This work was supported by the National Science Foundation of China (grant no. 51577175), NSAF (grant no. U1630106). We are also grateful to Elementec Ltd in Suzhou for its technical support. ; This work was supported by the National Science Foundation of China (grant no. 51577175), NSAF (grant no. U1630106). We are also grateful to Elementec Ltd in Suzhou for its technical support.
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/24851]
专题	中国科学院上海硅酸盐研究所
作者单位	1.[Ding, Xiang 2.Xiao, Li-Na 3.Li, Yi-Xuan 4.Tang, Zhong-Feng 5.Wan, Jia-Wei 6.Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China 7.[Ding, Xiang 8.Xiao, Li-Na 9.Li, Yi-Xuan 10.Tang, Zhong-Feng
推荐引用方式 GB/T 7714	Ding, Xiang,Xiao, Li-Na,Li, Yi-Xuan,et al. Improving the electrochemical performance of Li-rich Li1.2Ni0.2Mn0.6O2 by using Ni-Mn oxide surface modification[J]. JOURNAL OF POWER SOURCES,2018,390:13, 19.
APA	Ding, Xiang.,Xiao, Li-Na.,Li, Yi-Xuan.,Tang, Zhong-Feng.,Wan, Jia-Wei.,...&Chen, Chun-Hua.(2018).Improving the electrochemical performance of Li-rich Li1.2Ni0.2Mn0.6O2 by using Ni-Mn oxide surface modification.JOURNAL OF POWER SOURCES,390,13.
MLA	Ding, Xiang,et al."Improving the electrochemical performance of Li-rich Li1.2Ni0.2Mn0.6O2 by using Ni-Mn oxide surface modification".JOURNAL OF POWER SOURCES 390(2018):13.