摘要
以H3PO4、FeSO4·7H2O和LiOH·H2O为原料采用共沉淀法制备了球形锂离子电池正极材料LiFePO4,并通过掺碳提高其电导率。利用X射线多晶体衍射仪和扫描电子显微镜对样品的晶体结构、表观形貌进行分析。结果表明,制备的LiFePO4为规则圆球形,粒径0.5μm,电导率大于10-2数量级,具有3.3～3.4v左右的放电电压平台。0.5C倍率下放电,共沉淀法合成样品首次放电容量为140.2mAh/g;循环15次后放电比容量为139.5mAh/g。
Global LiFePO4, Li-ion battery cathode material, is synthesized by co-precipitation method with H3PO4, FeSO4·7H2O and LiOH·H2O. Carbon source was added to promote the conductivity. The morphology of particle, crystalline structure were analysed by XRD and SEM. The results show that the LiFePO4 is sphericity, average size 0.5μm, conductivity is higher than 10^-2 degree and it exhibits a 3.3～3.4 V discharge voltage plateau. The first snecific discharge canacitv （O.5 C） is 140.2mAh/g. After 15 times cycling, the snecific canacitv is 139.5mAh/g.
出处
《天津化工》
CAS
2007年第3期27-29,共3页
Tianjin Chemical Industry
