摘要
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。
Polyvinylpyrrolidone（PVP）,zinc acetate dehydrate,manganese acetate tetrahydrate and ethanol were chosen as main raw materials.The PVP/C4H6O4Zn/C4H12O8 Mn composite nanofibers were fabricated by electrospinning.Then ZnMn2O4 nanofibers as cathode materials for lithium-ionic batteries were obtained by annealing PVP/C4H6O4Zn/C4H12O8 Mn composite nanofibers at different temperatures.The thermal degradation process,morphology and crystal structure of the obtained materials were characterized by thermogravimetry analysis（TGA）,scanning electron microscope（SEM）,and X-ray diffraction（XRD）.The effects of different calcinated temperatures on electrochemical properties of ZnMn2O4 nanofibers were studied by galvanostatic cycling and cyclic voltammetry（CV）measurements.The results showed that there were remarkable changes for fiber＇s morphology before and after high temperature calcination.ZnMn2O4 characteristic diffraction peaks occurred.There were no appreciable differences on the first discharge capacities of ZnMn2O4 nanofibers obtained by different calcination temperatures,but the sample treated at 700℃ had good cycle performance.
出处
《化工新型材料》
CAS
CSCD
北大核心
2016年第9期136-138,共3页
New Chemical Materials
基金
中国博士后科学研究基金(2015T80496)
江苏高校"青蓝工程"优秀青年骨干教师培养对象资助项目
中央高校基本科研业务费专项资金资助项目(JUSRP51621A)
