镍酸锂派生物LiNi_(1-y)RE_yO_2的制备和性能

Preparation and properties of LiNi_(1-y)RE_yO_2 as the derivative compounds of LiNiO_2

首次报道了稀土金属(RE)氧化物添加到锂离子蓄电池正极材料LiNiO2中合成派生物的新方法,为LiNiO2的性能改善开辟了新的领域。采用增加系统氧气压力的方法,研究了派生物合成的工艺条件。对合成的材料进行了X射线衍射和扫描电镜分析,结果表明,铈部分取代镍很好地改善了活性正极材料的层状结构,使晶型结构更加完整有序。派生物LiNi1-xREyO2的放电比容量高达170mAh/g以上,可用于锂离子蓄电池作正极材料。

A new method to synthesize the derivative compound by adding rareearth(RE) metal oxides in LiNiO2, the cathode material for Liion battery, was reported for the first time. The technology conditions for synthesizing the derivative compound was researched by means of increasing the oxygen pressure in the system. The results of XRD and SEM to the synthesized material show that the layered structure of cathode active material is improved and its crystal structure is complete and orderly by partial substituting Ni with Ce. The specific discharge capacity of the derivative compound LiNi1-yREyO2 is more than 170 mAh/g, so it can be used as the cathode material for Liion battery.