纳米氧化锰的制备及其电化学性能研究

Studies on the preparation of Nano-size Manganese Oxide and the Electrochemical Property

用流变相-前驱物热分解法制备了纳米氧化锰粉末,用XRD、TEM和LPSA对粉末样品的组成、结构、粒度和形貌进行了表征。结果表明MnO和Mn3O4都属于立方晶系的球形粒子,平均粒径(d50)分别约为45.6nm和69.1nm。对MnO和Li2Mn2O4(由Mn3O4制备)的电化学性能研究表明,Li2Mn2O4具有较高的充放电容量和较好的循环性能,其首次放电容量为128mAh/g,经过十次充放电循环之后电容量仍有117.5mAh/g。而MnO的电化学性能欠佳。

Nano-size manganese oxide was prepared by means of the rheological phase-thermal decomposition of precursor. The composition and structure of the powder samples were characterized by the means of XRD.TEM and LPSA（laser particles size analyzer）. TEM results indicate that both MnO and Mn3O4 are spherical particles belong to cubic system, and the average diameter （ d50） of the particles is 45.631 nm and 69. l nm respectively. Study on the electrochemical properties of both MnO and Li2Mn2O4 （ be made from Mn3O4 ） shows the Li2Mn2O4 has excellent charge and discharge property and specific discharge capacity：its initial discharge specific capacity is 128 mAh/g, and the discharge specific capacity of the lOth is 117.5 mAh/g. Nevertheless, MnO has relatively poor electrochemical properties.