Wu Mao-Sung, Chiang Pin-Chi Julia, Lee Jyh-Tsung, Lin Jung-Cheng
Department of Chemical and Material Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807-78, Taiwan.
J Phys Chem B. 2005 Dec 15;109(49):23279-84. doi: 10.1021/jp054740b.
Manganese oxide electrodes composed of interconnected nanowires are electrochemically synthesized in manganous acetate solution at room temperature without any template and catalyst. Annealing temperature affects the electrode morphology, crystallization, and electrochemical performance. Scanning electron microscope (SEM) results show that nanowires are uniformly distributed and sizes are about 12-18 nm in diameter; the diameter decreases to about 8-12 nm after annealing at 300 degrees C. X-ray diffraction (XRD) and transmission electron microscope (TEM) images indicate that nanowires have poor crystalline characteristics. The higher the annealing temperature, the higher the crystalline degree is in manganese oxide. The synthesized anode material shows a much larger capacity than the traditional graphite materials for lithium storage. After annealing at 300 degrees C, the electrode's reversible capacity reaches 800 mAhg(-1), and the specific capacity retention remains nearly constant after 100 cycles.
由相互连接的纳米线组成的氧化锰电极在室温下于醋酸锰溶液中通过电化学方法合成，无需任何模板和催化剂。退火温度会影响电极的形态、结晶以及电化学性能。扫描电子显微镜（SEM）结果表明，纳米线均匀分布，直径约为12 - 18纳米；在300℃退火后，直径减小至约8 - 12纳米。X射线衍射（XRD）和透射电子显微镜（TEM）图像表明纳米线具有较差的结晶特性。退火温度越高，氧化锰中的结晶度越高。合成的阳极材料在锂存储方面表现出比传统石墨材料大得多的容量。在300℃退火后，电极的可逆容量达到800 mAhg(-1)，并且在100次循环后比容量保持率几乎恒定。
