三维有序多孔LiFePO4的制备及电化学性能

Preparation and electrochemical properties of three-dimensional ordered porous lithium iron phosphate

以过硫酸铵(APS)为引发剂引发苯乙烯进行乳液聚合制备尺寸均一的单分散聚苯乙烯(PS)微球,用垂直沉积方法制备高度有序性的密排结构聚苯乙烯胶体晶体,然后以聚苯乙烯胶体晶体为模版制备多孔LiFePO4电极材料。通过场发射扫描电子显微镜(SEM)对制备的材料形貌及孔道结构进行观察;通过X射线衍射仪(XRD)对其物相进行分析。结果表明,制备的LiFePO4电极材料呈多孔三维有序排列。并以制备的LiFePO4电极材料组装了纽扣式电池,对电池性质进行电化学测量,结果表明,三维有序多孔LiFePO4电极材料具有良好的电化学性能。

The polystyrene(PS)microspheres with monodisperse and uniform particle size were prepared by emulsion polymerization using styrene monomer as raw material and ammonium persulfate(APS)as initiator.A close-packed polystyrene colloidal crystal with three-dimensional order in a long range was prepared by a vertical deposition method.Three-dimensional ordered porous lithium iron phosphate(LiFePO4)was prepared using polystyrene colloidal crystal as a template.The physicochemical characteristics of the prepared samples were characterized by field emission scanning electron microscopy(SEM),X ray diffractometry(XRD)and electrochemical workstation.The prepared LiFePO4 were used to assemble button batteries,and the properties of the batteries were measured.The results indicated that the prepared three-dimensional ordered porous lithium iron phosphate electrode material has good electrochemical properties.