以硫酸镍、硫酸钴、偏铝酸钠为原料,通过共沉淀法制备超高镍NCA三元前驱体Ni_0.91Co_0.06Al_0.03(OH)₂,并通过高温固相法合成对应的正极材料LiNi_0.91Co_0.06Al_0.03O₂,利用扫描电子显微镜、X射线粉末衍射仪、粒度分析仪及电化学工作站对前驱体及对应正极材料的形貌、晶体结构、颗粒大小及电性能进行表征。测试结果表明:流量20mL/min得到的正极材料结晶度好,没有其他杂质存在,粒径在11μm左右,球形度好且一次颗粒分布均匀;电化学性能较好,0.1C下首次充电比容量为232.44mAh/g,首次放电比容量为211.49mAh/g,100圈后容量保持率为78.6%。

Ultrahigh-Nickel NCA ternary precursor Ni_0.91Co_0.06Al_0.03(OH)₂ was prepared by coprecipitation method with nickel sulfate,cobalt sulfate and sodium metaaluminate as raw materials.The corresponding cathode material Ni_0.91Co_0.06Al_0.03O₂ was synthesized by high temperature solid-state method.The morphology,crystal structure,particle size and electrical properties of the precursor and the corresponding cathode material were characterized by X-ray powder diffractometer,particle size analyzer and electrochemical workstation.The results shown that the cathode material of 20mL/min flow had good crystallinity and no other impurities.The obtained particle size was about 11μm,with good sphericity and uniform distribution of primary particles.It indicated that the cathode materials had better electrochemical properties.The first charge and discharge specific capacity were 232.44mAh/g and 211.49mAh/g at 0.1C.The capacity retention rate was 78.6% after 100 cycles.