Kinetics and structural changes of Li-Rich layered oxide 05Li 2MnO3·05LiNi0292Co 0375Mn0333O2 material investigated by a novel technique combining in situ XRD and a multipotential step

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	Kinetics and structural changes of Li-Rich layered oxide 05Li 2MnO3·05LiNi0292Co 0375Mn0333O2 material investigated by a novel technique combining in situ XRD and a multipotential step
	Shen, Chong-Heng ; Huang, Ling ; Lin, Zhou ; Shen, Shou-Yu ; Wang, Qin ; Su, Hang ; Fu, Fang ; Zheng, Xiao-Mei ; Huang L(黄令)
刊名	http://dx.doi.org/10.1021/am503132t
	2014
关键词	Electron diffraction Lithium alloys Lithium compounds Manganese Manganese oxide Nickel Transition metal compounds X ray powder diffraction
英文摘要	Li-rich layered oxide 0.5Li2MnO3·0.5LiNi 0.292Co0.375Mn0.333O2 was prepared by an aqueous solution-evaporation route. X-ray powder diffraction (XRD) showed that the as-synthesized material was a solid solution consisting of layered α-NaFeO2-type LiMO2 (M = Ni, Co, Mn) and monoclinic Li2MnO3. The superlattice spots in the selected area electron diffraction pattern indicated the ordering of lithium ions with transition metal (TM) ions in TM layers in this Li-rich layered oxide. Electrochemical performance testing showed that the as-synthesized material could deliver an initial discharge capacity of 267.7 mAh/g, with a capacity retention of 88.5% after 33 cycles. A new combination technique, multipotential step in situ XRD (MPS in situ XRD) measurement, was applied for the first time to investigate the Li-rich layered oxide. Using this approach, the relationships between kinetics and structural variations can be obtained simutaneously. In situ XRD results showed that the c parameter decreased from 3.70 to 4.30 V and increased from 4.30 to 4.70 V, whereas the a parameter underwent a decrease above 4.30 V during the first charge process. Below 3.90 V during the first discharge process, a slight decrease in the c parameter was found along with an increase in the a parameter. During the first charge process, the value of the coefficient of diffusion for lithium ions (DLi+) decreased to its mininum at 4.55 V, which might be associated with Ni2+ migration, as indicated by both Ni occupancy in 3b sites (Ni3b%) in the Li + layers and complicated chemical reactions. Remarkably, a lattice distortion might occur within the local domain in the host stucture during the first discharge process, indicated by a slight splitting of the (003) diffraction peak at 3.20 V. ? 2014 American Chemical Society.
语种	英语
出版者	American Chemical Society
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89766]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Shen, Chong-Heng,Huang, Ling,Lin, Zhou,et al. Kinetics and structural changes of Li-Rich layered oxide 05Li 2MnO3·05LiNi0292Co 0375Mn0333O2 material investigated by a novel technique combining in situ XRD and a multipotential step[J]. http://dx.doi.org/10.1021/am503132t,2014.
APA	Shen, Chong-Heng.,Huang, Ling.,Lin, Zhou.,Shen, Shou-Yu.,Wang, Qin.,...&黄令.(2014).Kinetics and structural changes of Li-Rich layered oxide 05Li 2MnO3·05LiNi0292Co 0375Mn0333O2 material investigated by a novel technique combining in situ XRD and a multipotential step.http://dx.doi.org/10.1021/am503132t.
MLA	Shen, Chong-Heng,et al."Kinetics and structural changes of Li-Rich layered oxide 05Li 2MnO3·05LiNi0292Co 0375Mn0333O2 material investigated by a novel technique combining in situ XRD and a multipotential step".http://dx.doi.org/10.1021/am503132t (2014).