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首页> 外文期刊>Journal of power sources >Structural characterization of layered Na0.5Co0.5Mn0.5O2 material as a promising cathode for sodium-ion batteries
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Structural characterization of layered Na0.5Co0.5Mn0.5O2 material as a promising cathode for sodium-ion batteries

机译：Na0.5Co0.5Mn0.5O2层状材料的结构表征，可作为钠离子电池的正极材料

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摘要

Layered Na0.5Co0.5Mn0.5O2 material is synthesized through a facile mixed hydroxy-carbonate route using (Co0.5Mn0.5)(2)(OH)(2)CO3 precursor and well characterized as a hexagonal layered structure under P6(3)/mmc space group. The lattice parameters and unit cell volume (a = 2.8363 angstrom, c = 11.3152 angstrom and V = 78.83 angstrom(3)) are calculated by Rietveld refinement analysis. A flaky-bundle morphology is obtained to the layered Na0.5Co0.3Mn0.5O2 material with the hexagonal flake size similar to 30 nm. Advanced transmission electron microscopic images are revealed the local structure of the layered Na0.5Co0.5Mn0.5O2 material with contrasting bright dots and faint dark dots corresponding to the Co/Mn and Na atoms. Two oxidation and reduction peaks are occurred in a cyclic voltammetric analysis corresponding to Co3+/Co4+ and Mn3+/Mn4+ redox processes. These reversible processes are attributed to the intercalation/de-intercalation of Na+ ions into the host structure of layered Na0.5Co0.5Mn0.5O2 material. Accordingly, the sodium cell is delivered the initial charge-discharge capacity 53/144 mAh g(-1), at 0.5 C, which cycling studies are extended to rate capability test at 1 C, 3 C and 5C. Eventually, the Na-ion full-cell is yielded cathode charge-discharge capacity 55/52 mAh g(-1) at 0.212 mA and exhibited as a high voltage cathode for Na-ion batteries. (C) 2017 Elsevier B.V. All rights reserved.
机译：使用（Co0.5Mn0.5）（2）（OH）（2）CO3前驱体，通过简便的混合羟基碳酸盐路线合成Na0.5Co0.5Mn0.5O2层状材料，并在P6（3）下很好地表征为六方层状结构）/ mmc空间组。晶格参数和晶胞体积（a = 2.8363埃，c = 11.3152埃，V = 78.83埃（3））通过Rietveld精炼分析计算。获得具有六角形薄片尺寸类似于30nm的层状Na0.5Co0.3Mn0.5O2材料的薄片状束形态。先进的透射电子显微镜图像显示了Na0.5Co0.5Mn0.5O2层状材料的局部结构，具有对应于Co / Mn和Na原子的对比亮点和暗暗点。在循环伏安分析中出现了两个氧化和还原峰，分别对应于Co3 + / Co4 +和Mn3 + / Mn4 +氧化还原过程。这些可逆过程归因于将Na +离子嵌入/去嵌入层状Na0.5Co0.5Mn0.5O2材料的主体结构中。因此，在0.5 C时，钠电池的初始充放电容量为53/144 mAh g（-1），循环研究扩展到1 C，3 C和5C的速率容量测试。最终，Na离子全电池在0.212 mA时产生了55/52 mAh g（-1）的阴极充放电容量，并显示为Na离子电池的高压阴极。 （C）2017 Elsevier B.V.保留所有权利。

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