氧化锰纳米颗粒的低温水热合成及其电化学性能

Low-temperature Hydrothermal Synthesis and Electrochemical Performance of Manganese Oxide Nanoparticles

基于高锰酸钾和葡萄糖之间的氧化还原反应,采用低温水热法合成了氧化锰纳米颗粒材料。应用X-射线衍射、扫描电镜和氮气吸脱附技术对所得材料的结构、形貌和表面性质进行表征。结果表明,所得材料为低结晶性Birnessite型层状氧化锰,比表面积为129 m2/g。电化学测试结果显示,氧化锰纳米颗粒负极材料具有较高的比容量、较好的循环性能和倍率性能。在100 m A/g的电流密度下,首次放电比容量为635 m Ah/g。恒流充放电130次后,容量保持率为65.4%。

Manganese oxide nanoparticles have been synthesized based on redox reaction between KMnO4 and glucose with a low-temperature hydrothermal method. The obtained material is characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption-desorption. Results show that the product is Birnessite-type layered manganese oxide with low crystallinity and the specific surface area is 129 m^2/g. Electrochemical measurements indicate manganese oxide has high specific capacity, good cycling performance and rate capability as an anode material. It exhibits an initial discharge capacity of 635 mAh/g at the current density of 100 mA/g. And the capacity retention reaches 65.4% after 130 cycles.