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采用共沉淀法合成球形前驱体Ni_(0.8)Mn_(0.2)(OH)_2,混合LiOH·H_2O通过高温烧结制备出锂离子电池镍基正极材料LiNi_(0.8)Mn_(0.2)O_2。通过X射线衍射(XRD)、扫描电镜(SEM)、热重-差热分析(TG-DTA)以及恒电流充放电测试对材料进行表征,研究了烧结温度和烧结气氛对材料结构、形貌和电化学性能的影响。结果表明:800℃纯氧气氛(0.6L/min)下煅烧12h合成的材料晶型完整,是典型的六方晶系α-NaFeO_2型结构;SEM测试显示材料平均粒径在10μm左右;电化学性能测试显示材料在25℃、2.75~4.20V、0.2C充放电条件下,首次放电比容量达173.6mAh/g,循环95次后,容量保持率达90.73%。
The Ni - (0.8) Mn 0.2 Mo (0.2) O 2 was prepared by co - precipitation method and mixed with LiOH · H 2 O at high temperature to prepare LiNi 0.8 Mn 0.2 O 2 as cathode material for lithium ion batteries. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), TG-DTA and galvanostatic charge-discharge test. The effect of sintering temperature and sintering atmosphere on the structure, morphology and Electrochemical properties of the impact. The results show that the crystal of α-NaFeO 2 is a typical hexagonal α-NaFeO 2 structure after calcination at 800 ℃ in pure oxygen atmosphere (0.6L / min) for 12h. The SEM results show that the average particle size of the material is about 10μm. The electrochemical properties The test shows that the initial discharge capacity reaches 173.6mAh / g at 25 ℃, 2.75 ~ 4.20V and 0.2C. After 95 cycles, the capacity retention rate reaches 90.73%.