CAJ | 학술논문

文章以微米级氧化铁为原料，通过前驱体预处理合成LiFePO4／C正极材料，采用X射线衍射（XRD）、扫描电子显微镜（SEM）及透射电子显微镜（TEM）等手段对合成的磷酸铁锂材料结构和微观形貌进行表征，考察了不同球磨时间对浆料粒径的影响，分析了前驱体预处理对合成产物性能提升的原因。结果表明，以微米氧化铁为原料，经过预处理后制备得到的LiFePO4／C正极材料的电化学性能具有明显改善，0.2C和1C条件下，放电容量较之前驱体未处理样品分别提高了22.5％和27.3％，合成样品性能改善的主要原因在于前驱体预处理降低了二次团聚体粒径。
문장이미미급양화철위원료，통과전구체예처리합성LiFePO4／C정겁재료，채용X사선연사（XRD）、소묘전자현미경（SEM）급투사전자현미경（TEM）등수단대합성적린산철리재료결구화미관형모진행표정，고찰료불동구마시간대장료립경적영향，분석료전구체예처리대합성산물성능제승적원인。결과표명，이미미양화철위원료，경과예처리후제비득도적LiFePO4／C정겁재료적전화학성능구유명현개선，0.2C화1C조건하，방전용량교지전구체미처리양품분별제고료22.5％화27.3％，합성양품성능개선적주요원인재우전구체예처리강저료이차단취체립경。
LiFePO4/C cathode material was prepared by precursor pretreatment method with micron‐Fe2 O3 as raw material .The structural and morphological characteristics of the prepared LiFePO 4/C were characterized by X‐ray diffraction(XRD) ,scanning electron microscope(SEM) and transmission electron microscope(TEM) .The effect of different milling time on the size of mixture was investiga‐ted ,and the reasons for precursor pretreatment in improving the performance of material were ana‐lyzed .The experimental results show that the prepared sample with pretreatment exhibits the good electrochemical performance and the discharge capacity at 0.2C increases 22.5% and at 1C increases 27.3% ,which is higher than that of LiFePO4/C without pretreatment ,respectively .The precursor pretreatment is helpful in improving the electrochemical performance ,because the method can reduce the size of secondary aggregate .