【摘要】 利用静电纺丝技术成功制备了60~80nm的氧化锰纳米纤维丝,并构建了三维纳米丝网状结构电极,应用于锂离子二次电池.使用扫描电子显微镜、X射线衍射、循环伏安和电池充放电等研究手段,表征了纳米纤维丝的结构和电化学性能.研究结果发现:氧化锰构建的纳米丝在嵌锂和脱锂的过程中没有出现纳米纤维丝的结构塌陷问题,在高能量密度下表现出较大的可逆循环容量,放电容量达到160mAh/g.经过50次循环后,容量可达132.5mAh/g,平均每次循环的容量衰减在1%以下.这些结果表明了氧化锰纳米纤维丝可作为三维锂离子电池中的阴极材料.更多还原

【Abstract】 Manganese oxides nanofibers were successfully fabricated by an electrospinning method and its electrochemical behavior was investigated as three-dimensional(3D) architecture of cathodic materials.Scanning electron microscope,X-ray diffraction and the discharge/charge curves were used to characterize their structures and electrochemical properties.Manganese oxides nanofibers are achieved after calcination at 450℃.The high reversible discharge capacity reaches 160mAh/g and the discharge capacity is about 132.5mAh/g with capacity loss less than 1.0% per cycle in 50 cycling.SEM observations show that the structure of manganese oxides nanofibers is stable without the mechanical destruction of nanofibers during the Li+ ion intercalation and deintercalation.The results demonstrate that manganese oxides nanofibers are promising cathodic materials for 3D lithium batteries.更多还原