用共沉淀的方法制备了改性的锂离子电池正极材料LiFePO4,利用X射线衍射(XRD)、扫描电镜(SEM)、傅立叶红外光谱(FTIR)等方法对样品的晶体结构、表观形貌、谱学性质等进行了分析研究,并在表观形貌和电性能上与固相法制备的样品进行比较.结果表明,此种方法制备的LiFePO4为单一的橄榄石型晶体结构,具有3.4V左右的放电电压平台,该材料具有良好的电性能,分别以0.2,0.4mA/cm2的电流密度充放电,首次放电比容量达到142.3,127mAh/g,充放电循环20次后放电比容量仍保持在129.7,105.5mAh/g.
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