论文部分内容阅读
以聚乙烯吡咯烷酮(PVP)、Zn(CH3COO)2·2H2O、Mn(CH3COO)2·4H2O和乙醇为原料,采用静电纺丝法制备PVP/C4H6O4Zn/C4H12O8Mn复合纳米纤维,经过不同温度煅烧得到ZnMn_2O_4纳米纤维,将其运用于锂离子电池负极材料,探讨了煅烧温度对材料结构形貌和电化学性能的影响。利用热重、扫描电镜和X射线衍射等对其热解过程、形貌和晶型结构等进行了表征,通过恒流充放电测试研究煅烧温度对ZnMn_2O_4纳米纤维电化学性能的影响。结果表明:经高温煅烧后纤维形貌发生明显变化,出现了ZnMn_2O_4特征衍射峰,不同温度下煅烧处理后样品的首次放电比容量差异不大,但700℃处理后的样品具有较好的循环性能。
PVP / C4H6O4Zn / C4H12O8Mn composite nanofibers were prepared by electrospinning using polyvinylpyrrolidone (PVP), Zn (CH3COO) 2 · 2H2O, Mn (CH3COO) 2.4H2O and ethanol as raw materials, calcined at different temperatures to obtain ZnMn2O4 nanometer Fiber, which is applied to the negative electrode material of lithium ion battery, and the effect of calcination temperature on the structure and electrochemical properties of the material is discussed. The pyrolysis process, morphology and crystal structure were characterized by thermogravimetry, scanning electron microscopy and X-ray diffraction. The influence of calcination temperature on the electrochemical performance of ZnMn 2 O 4 nanofibers was investigated by galvanostatic charge-discharge test. The results show that the morphology of ZnMn 2 O 4 peaks after the calcination at high temperature, and the first discharge specific capacity after calcination at different temperatures is not different. However, the samples annealed at 700 ℃ have better cycling performance .