Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials
Chemical mixing in molten-salt for preparation of high-performance spinel lithium manganese oxides: Duplication of morphology from nanostructured MnO2 precursors to targeting materials
复制标题
熔盐中的化学混合制备高性能尖晶石锂锰氧化物：从纳米结构 MnO2 前体到靶向材料的形态复制
DOI：
10.1016/j.electacta.2012.10.109
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发表时间：
2013-01
影响因子：
6.6
通讯作者：
Dihua Wang
中科院分区：
文献类型：
--
作者：
Wenting Liu;Xuhui Mao;Hua Zhu;Dihua Wang
从熔盐混合过程中 Li/Mn 化学计量、前体纳米结构 MnO2 的晶相和微观结构的影响，讨论了 450°C 熔盐锂化和 800°C 后退火对纳米结构含钾锰氧化物形成尖晶石锂锰氧化物形态复制品的化学混合策略。结果表明，晶格中具有合适尺寸的一维隧道的α-MnO2有利于Li、Mn和O化学级混合物的形成，并确保熔盐锂化后的形态保留。与α-MnO2相比，δ-MnO2晶格的层间间隙太大，无法确保化学水平的混合或形态保留。建议谨慎控制熔盐处理过程中的初始Li/Mn比，以抑制Li的过度表面吸收，促进有效的Li/K交换过程。此外，一维纳米结构的前体氧化锰在退火后处理后的形态保留方面比其纳米粒子对应物更有优势，因为它对大局部应变的稳定性增强。电化学测量表明，所制备的纯相、高结晶尖晶石型尖晶石型锂锰氧化物纳米棒是前体α-MnO2纳米棒的形态复制品，在10C倍率下充放电循环200次后，可逆比容量为94mAhg−1。
The chemical mixing strategy involving molten-salt lithiation at 450°C and post-annealing at 800°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 α-MnO2with suitable-sized one-dimensional tunnels in lattices facilitates the formation of chemical-level mixture of Li, Mn and O, and ensuring morphological retention after molten-salt lithiation. Compared to α-MnO2, the interlayer gap in δ-MnO2crystal 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 spinel-typed lithium manganese oxide nanorods in morphological replica of precursory α-MnO2nanorods deliver a reversible specific capacity 94mAhg−1upon 200 times of charge–discharge cycling at a rate of 10C.
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影响因子：
3.9
作者：
J. Tarascon;W. Mckinnon;F. Coowar;T. Bowmer;G. Amatucci;D. Guyomard
通讯作者：
J. Tarascon;W. Mckinnon;F. Coowar;T. Bowmer;G. Amatucci;D. Guyomard
影响因子：
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作者：
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作者：
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用于电化学能量转换和存储装置的纳米结构材料
影响因子：
29.4
作者：
Guo, Yu-Guo;Hu, Jin-Song;Wan, Li-Jun
通讯作者：
Wan, Li-Jun
影响因子：
4.9
作者：
Sunhye Lim;Jaephil Cho
通讯作者：
Sunhye Lim;Jaephil Cho