Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, PR China.
ACS Appl Mater Interfaces. 2012 Mar;4(3):1636-42. doi: 10.1021/am2017909. Epub 2012 Mar 16.
A facile one-step solvothermal reaction route to large-scale synthesis of carbon homogeneously wrapped manganese oxide (Mn(3)O(4)@C) nanocomposites for anode materials of lithium ion batteries was developed using manganese acetate monohydrate and polyvinylpyrrolidone as precursors and reactants. The synthesized Mn(3)O(4)@C nanocomposites were characterized by X-ray diffraction, field-emission scanning electron microscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The synthesized tetragonal structured Mn(3)O(4) (space group I41/amd) samples display nanorodlike morphology, with a width of about 200-300 nm and a thickness of about 15-20 nm. It is shown that the carbon layers with a thickness of 5 nm are homogeneously coated on the Mn(3)O(4) nanorods. It is indicated from lithium storage capacity estimation that the Mn(3)O(4)@C samples display enhanced capacity retention on charge/discharge cycling. Even after 50 cycles, the products remains stable capacity of 473 mA h g(-1), which is as much 3.05 times as that of pure Mn(3)O(4) samples. Because of the low-cost, nonpollution, and stable capacity, the carbon homogeneously coated Mn(3)O(4)@C nanocomposites are promising anode material for lithium ion batteries.
一种简便的一步溶剂热反应路线，用于大规模合成碳均匀包裹的氧化锰（Mn(3)O(4)@C）纳米复合材料，作为锂离子电池的阳极材料。使用醋酸锰一水合物和聚乙烯吡咯烷酮作为前体和反应物，开发了这种方法。通过 X 射线衍射、场发射扫描电子显微镜、高分辨率透射电子显微镜、X 射线光电子能谱和拉曼光谱对合成的 Mn(3)O(4)@C 纳米复合材料进行了表征。合成的四方结构 Mn(3)O(4)（空间群 I41/amd）样品显示出纳米棒状形态，宽度约为 200-300nm，厚度约为 15-20nm。结果表明，厚度为 5nm 的碳层均匀地包覆在 Mn(3)O(4)纳米棒上。从锂存储容量估计表明，Mn(3)O(4)@C 样品在充放电循环中表现出增强的容量保持率。即使经过 50 次循环后，该产物仍保持稳定的容量为 473mA h g(-1)，是纯 Mn(3)O(4)样品的 3.05 倍。由于成本低、无污染和稳定的容量，碳均匀包覆的 Mn(3)O(4)@C 纳米复合材料有望成为锂离子电池的阳极材料。
