CAJ | 학술논문

分别以5种含碳有机物为碳源,通过固相热裂解法制备了5种LiFePO_4/C复合正极粉体材料,利用XRD和拉曼光谱表征了复合粉体中碳的结构.复合材料含有单一的磷酸铁锂相,裂解碳以无定型形式存在.不同裂解碳D、G拉曼峰的强度有所不同,其比值R反映了石墨化程度的强弱.对于石墨化程度高的LiFePO_4/C复合正极材料,其电子电导性能高,反映在电池容量性质上就是电池容量高.比较不同有机前驱体对复合正极材料的作用效果,聚乙烯醇是较佳的选择.
분별이5충함탄유궤물위탄원,통과고상열렬해법제비료5충LiFePO_4/C복합정겁분체재료,이용XRD화랍만광보표정료복합분체중탄적결구.복합재료함유단일적린산철리상,렬해탄이무정형형식존재.불동렬해탄D、G랍만봉적강도유소불동,기비치R반영료석묵화정도적강약.대우석묵화정도고적LiFePO_4/C복합정겁재료,기전자전도성능고,반영재전지용량성질상취시전지용량고.비교불동유궤전구체대복합정겁재료적작용효과,취을희순시교가적선택.
LiFePO_4/C composite cathode material was prepared by solid-phase pyrolysis process with five kinds of organic carbon as the source. The structure of the carbon in the composite powder was characterized by XRD and Raman spectrum. The single LiFePO_4 phase and amorphous carbon can be found in the products. The intensity of the D, G bands in different organic matter is varied. The Raman intensity ratio of D/G bands reflects the degree of graphitization. The LiFePO_4/C compound cathode material with high degree of graphitization has high electronic conductivity, which also has high battery capacity. Comparing the effect of different organic precursor on the performance of the compound cathode material, PVA is optimum.