【摘要】 通过溶胶-凝胶法制备LiNi_0.8Co_0.1Mn_0.1O₂正极材料,研究了烧成温度对材料结构、形貌和电化学性能的影响。采用XRD、SEM及恒流充放电测试对材料性能进行表征。分析结果表明,材料均呈现典型的α-NaFeO₂层状结构且阳离子有序度较好。不同烧成温度时材料形貌呈现不规则块状且粒径随着温度的增加而增大;温度低于780℃时,材料结晶性不好,生长不完全;温度高于800℃时,材料团聚现象严重、形貌不规整。烧成温度为800℃时材料有较好的电化学性能,在5 C高倍率充放电下,首次放电比容量为147.95 mAh/g,循环200次后,容量保持率为76.71%。更多还原

【Abstract】 LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials were prepared by sol-gel method.The structure,morphology and electrochemical performance of the materials synthesized by the different sintering temperature were characterized through XRD,SEM and constant current charge and discharge tests.The results show that all the materials are characterized by a typical α-NaFeO₂ layered structure with good cation order.The morphology of the cathode materials shows irregular block shape.The particle size increases with the higher sintering temperature.At the same time,the crystal face is not well developed with poor crystallinity when the sintering temperature is lower than 780℃.However,the primary particles are easy to agglomerate when the sintering temperature is higher than 800 ℃.The cathode materials sintered at 800℃. has the best electrochemical performance:the first discharge specific capacity is 147.95 mAh/g at 5 C high rate charge and discharge after200 cycles.The capacity retention rate reaches 76.71%.更多还原