【摘要】 以硝酸铁[Fe（NO₃）₃·9H₂O]为初始原料制备三氧化二铁（Fe₂O₃）胶体,并以所制备的Fe₂O₃胶体作为铁源及分散体系,以磷酸二氢锂（LiH₂PO₄）作为锂源和磷源,通过喷雾干燥法及热处理技术得到球形磷酸铁锂（LiFePO₄）正极材料。采用XRD、SEM、TEM及恒流充放电等分析手段研究了活性剂类型、复合胶体含量及热处理工艺对球形LiFePO₄正极材料的结构、微观形貌及电化学性能的影响。结果表明:当十六烷基三甲基溴化铵（CTAB）作为活性剂,复合胶体含量为50%（wt,质量分数）,采用两段式热处理工艺合成的LiFePO₄颗粒形貌完整、成球度高且粒度分布均匀,其颗粒平均粒径约为1²μm。充放电平台稳定,其0.1C首次放电容量达146.2mA·h/g。更多还原

【Abstract】 Fe（NO₃）₃·9H₂O was employed as the raw material for preparing Fe₂O₃ colloid,stable complex colloids can be achieved when the iron source and dispersion system were Fe₂O₃ colloid above prepared,LiH₂PO₄ as the lithium source and phosphorus source,and then the spherical anode material LiFePO₄ can be obtained through the spray drying method and heat treatment technology.Material analysis tools,such as XED,SEM and TEM,were employed to study the effect of the active agent types,the solid content of compound gel and heat treatment on the phase and microstructure of LiFePO₄.The results showed that:when the active agent was CTAB,The solid content of compound gel was 50%,heat treatment process was two-stage,the LiFePO₄ particle possessed complete morphology,good agglomeration degree and uniformity particle size,what’s more,the average particle diameter of LiFePO₄ particle was 1²μm.Charge and discharge platform was stability,the initial discharge capacity of the material at 0.1Cwas 146.2mA·h/g.更多还原