Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials

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	Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials
	W. Xiao; W. T. Liu; X. H. Mao; H. Zhu; D. H. Wang
	2013
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	88 页码:756-765
摘要	The chemical mixing strategy involving molten-salt lithiation at 450 degrees C and post-annealing at 800 degrees C on formation of morphological replica of spinel lithium manganese oxides from nanostructured potassium-contained manganese oxides has been discussed in terms of influences of Li/Mn stoichiometry during molten-salt mixing, crystal phases and microstructure of precursory nanostructured MnO2. It is exhibited that alpha-MnO2 with suitable-sized one-dimensional tunnels in lattices facilitates the formation of chemical-level mixture of Li, Mn and 0, and ensuring morphological retention after molten-salt lithiation. Compared to alpha-MnO2, the interlayer gap in delta-MnO2 crystal lattices is too large to ensure chemical-level mixture or morphology retention. It is suggested that the precursory Li/Mn ratio during molten-salt treatment should be prudently controlled, aiming to restraining excessive surface-absorption of Li and facilitating an effective Li/K exchange process. Also, one-dimensional nanoarchitectured precursory manganese oxide is advantageous over its nanoparticle counterparts on morphological retention after post-annealing process, due to its the enhanced stability against large local strains. Electrochemical measurements show that the prepared phase-pure and highly crystalline spinet-typed lithium manganese oxide nanorods in morphological replica of precursory alpha-MnO2 nanorods deliver a reversible specific capacity 94 mAh g(-1) upon 200 times of charge-discharge cycling at a rate of 10 C. (C) 2012 Elsevier Ltd. All rights reserved.
部门归属	[xiao, wei ; liu, wenting ; mao, xuhui ; zhu, hua ; wang, dihua] wuhan univ, sch resource & environm sci, wuhan 430072, peoples r china. [wang, dihua] chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china. ; wang, dh (reprint author), wuhan univ, sch resource & environm sci, wuhan 430072, peoples r china. ; wangdh@whu.edu.cn
关键词	Spinel Lithium Manganese Oxide Molten Salt Lithiation Manganese Oxide Lithium-ion Battery Ion Batteries Cathode Materials Electrochemical Properties Electrode Material Composite Electrodes Lim0.05mn1.95o4 m Limn2o4 Nanorods Li/limn2o4 Cells Rate Capability Insertion
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71595
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Xiao,W. T. Liu,X. H. Mao,et al. Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials[J]. Electrochimica Acta,2013,88:756-765.
APA	W. Xiao,W. T. Liu,X. H. Mao,H. Zhu,&D. H. Wang.(2013).Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials.Electrochimica Acta,88,756-765.
MLA	W. Xiao,et al."Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials".Electrochimica Acta 88(2013):756-765.