O3型正极材料因较高的理论比容量成为钠离子电池正极材料研究的热点。采用共沉淀法制备Ni_0.33Fe_0.33Mn_0.33(OH)₂前驱体并配钠煅烧为O3-NaNi_0.33Fe_0.33Mn_0.33O₂正极材料,探究煅烧温度对该正极材料物相结构与电化学性能的影响。结果表明,煅烧温度影响正极材料表面钠残渣含量,进而影响其电化学性能。2.0~4.0 V的电压范围内,850℃下制备的NaNi_0.33Fe_0.33Mn_0.33O₂正极材料表现出最优电化学性能,1 C下循环100次后容量保持率为71.08%,5 C下放电比容量为91.67 mAh/g。

O3-type cathode material has become a research hotspot for sodium-ion battery due to its high theoretical specific capacity.Ni_0.33Fe_0.33Mn_0.33(OH)₂ precursor is prepared via a coprecipitation method,and then calcined with sodium to obtain O₃-NaNi_0.33Fe_0.33Mn_0.33O₂ cathode material.The influence of calcination temperature on the phase structure and electrochemical performance of this cathode material is explored.Results show that calcination temperature affects the content of sodium residue on the surface of the cathode material,which in turn affects its electrochemical performance.Within the voltage range of 2.0-4.0 V,NaNi_0.33Fe_0.33Mn_0.33O₂ cathode material prepared at 850℃ exhibits the optimal electrochemical performance,its capacity retention rate is 71.08% after 100 cycles at 1 C and its discharge specific capacity is 91.67 mAh·g^-1 at 5 C.

刘冬梅(1985-),女,硕士,讲师,研究方向为新能源材料与器件,sally8291@hotmail.com;何一芃(1995-),男,硕士,工程师,研究方向为新能源材料与器件,通讯联系人,heyipeng.cy@crrcgc.cc。