标题：Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials作者：Xiao, Wei; Liu, Wenting; Mao, Xuhui; Zhu, Hua; Wang, Dihua
来源出版物：ELECTROCHIMICA ACTA 卷：88 页：756-765 出版年：JAN 15 2013
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.
作者关键词：Spinel lithium manganese oxide, Molten salt lithiation, Manganese oxide, Lithium-ion battery
扩展关键词：ION BATTERIES; CATHODE MATERIALS; ELECTROCHEMICAL PROPERTIES; ELECTRODE MATERIAL; COMPOSITE ELECTRODES; LIM0.05MN1.95O4 M; LIMN2O4 NANORODS; LI/LIMN2O4 CELLS; RATE CAPABILITY; INSERTION
通讯作者地址：Wang Dihua;Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
[Xiao, Wei; Liu, Wenting; Mao, Xuhui; Zhu, Hua; Wang, Dihua] WuhanUniv, Sch Resource & Environm Sci,Wuhan430072, Peoples RChina.
[Wang, Dihua] Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res,Shenyang110016, Peoples RChina.
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