固相反应法的固有缺陷使其磷酸铁锂产物难以规模用于动力锂离子电池领域。包括沉淀法和水热法在内的液相合成途径正在该领域扮演越来越重要的角色。使用不同的沉淀方法制备了纳米磷酸铁锂材料,用粉末X射线衍射、场发射电子显微镜、充放电测试等方法进行了对比研究,对沉淀方法进行了优选并解释了所制材料性能差别的机理。详细研究了煅烧温度对磷酸铁锂材料的平均粒径、粒径分布、晶粒形貌等方面的影响。
The intrinsic defects of solid-state synthesis make the derived lithium iron phosphate products difficult to be mass applied to the field of power grade Li-ion batteries.However,liquid phase synthetic routes including precipitation and hydrothermal synthesis were playing more and more important roles.Nanometric LiFePO4 materials are prepared by various precipitation methods.The samples were characterized by powder X-ray diffraction,field-emission scanning electron microscopy,and automatic charge-discharge measurement.The results were analyzed to select the best precipitation method.The mechanism involved in the performance differences among the prepared LFP materials were explained.The effects of calcination temperature on the average particle size,the particle size distribution,and the crystallite morphology were studied in details.
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