水热法制备LiFePO_4及其电化学性能的研究

Hydrothermal synthesis of lithium iron phosphate cathodes and its electrochemical Performance

采用水热法制备锂离子电池正极材料LiFePO4,研究了制备工艺条件对LiFePO4结构和电化学性能的影响.采用扫描电镜及X射线仪对制备材料进行了表征,采用恒流充放电测试研究材料的电化学性能.实验验结果证明,采用水热法制备LiFePO4的适宜条件为:反应物摩尔比为Li:Fe=3:1,反应温度120℃,反应时间10 h,干燥时间为6 h.

Hydrothermal synthesis was employed to prepare LiFePO4 powders in this paper.The effects of synthesis conditions on structure and electrochemical behavior of LiFePO4 were studied.X-Ray Diffraction（XRD） was used to analyze phase composition.Scanning Electron Microscope（SEM） was used to observe superficial morphology,and charge-discharge test was used to study the specific capacity.The results show that the appropriate conditions of preparation of the LiFePO4 are as follows：the ratio of reactant Li：Fe is 3：1;hydrothermal temperature is120℃;hydrothermal time is 10 h;evaporation time is 6 h.