中文摘要：

以在水热条件下合成的纳米结构γ-MnOOH为前驱物,以K2S2O8为氧化剂,采用单模式微波加热法制备出一维纳米结构MnO2.采用XRD和TEM等手段对样品进行了表征.以在100℃下水热合成的γ-MnOOH纳米纤维为前驱物时,制得α-MnO2纳米纤维;以在150℃下水热合成的γ-MnOOH纳米棒为前驱物时,制得β-MnO2纳米棒.分别用α-MnO2纳米纤维和β-MnO2纳米棒作为Li/MnO2电池的正极材料进行恒电流放电实验,研究结果显示,α-MnO2纳米纤维的放电容量为270.23 mA·h/g,β-MnO2纳米棒的放电容量为186.66 mA·h/g.

英文摘要：

Based on the hydrothermally-synthesized nanostructured γ-MnOOH precursor and with K2S2O8 as an oxidant, nanostructured α/β-MnO2 samples were prepared by a singel-mode microwave-heating method. The samples were characterized by X-ray diffraction and Transmission Electron Microscopy. The results show that α-MnO2 nanofibers were prepared when the γ-MnOOH nanofibers synthesized at 100 ℃ were used as the precursors, while β-MnO2 nanorods were obtained with the T-MnOOH nanorods synthesized at 150 ℃ as the precursors. The electrochemical performance of α/β-MnO2 was also investigated by galvanostatic discharge test. When the as-prepared α-MnO2 nanofiber and β-MnO2 nanorod samples are used for Li/MnO2 battery, the discharge capacities are 270.23 and 186.66 mA · h/g, respectively.