富锂锰基正极材料包覆改性研究毕业论文

毕 业 论 文富锂锰基正极材料 Li 1.2Mn0.54Ni0.13Co0.13O2 包覆改性讨论毕业设计（论文）中文摘要富锂锰基正极材料 Li1.2Mn0.54Ni0.13Co0.13O2包覆改性讨论摘要： 本文以 Mn0.54Ni0.13Co0.13(OH)2为前驱体、Li2CO3为锂源，通过高温固相法合成富锂锰基正极材料 Li1.2Mn0.54Ni0.13Co0.13O2。用液相法对其进行 AlF3包覆，采纳 XRD 和 SEM 对材料的结构和形貌进行表征，采纳恒流充放电测试对材料的电化学性能进行表征。分别以 AlF3包覆量、包覆溶液 pH 值和热处理温度为考察因素进行单因素实验以确定最优的包覆工艺。结果表明，当包覆量为 2wt.%，包覆溶液 pH=9，热处理温度为 400°C 时，材料的首次充放电性能和倍率放电性能最好。首次充放电效率由 58.7%提高到 73.6%，0.2C、0.5C 和1.0C 下放电比容量分别由 184.9mAh/g、171.4mAh/g 和 153.0mAh/g提高到 239.6mAh/g、229.9mAh/g 和 215.9mAh/g。当包覆量为 2wt.%，包覆溶液 pH=9，热处理温度为 450°C 时，材料的循环性能最好，在0.5C 时 50 次循环后放电比容量由 143.6mAh/g 提高到 176.7mAh/g。关键词： 富锂正极材料 Li1.2Mn0.54Ni0.13Co0.13O2AlF3包覆 电化学性能毕 业 设 计 （ 论 文 ） 外 文 摘 要Research on the coating modification of Li1.2Mn0.54Ni0.13Co0.13O2 cathode materialAbstractLi1.2Mn0.54Ni0.13Co0.13O2 cathode material was synthesized by high-temperature solid-state method using Mn0.54Ni0.13Co0.13(OH)2 as precursor and Li2CO3 as lithium source.AlF3 coating was carried out by liquid phase method.The structure and morphology of the materials were characterized by XRD and SEM, and the electrochemical properties of the materials were characterized by constant-current charge/discharge tests. The AlF3 coating amount, pH value of coating solution and heat treatment temperature were regarded as single factors to determine the optimal parameters of AlF3 coating process.The results show that when coating amount is 2wt%, pH value of coating solution is 9, heat treatment temperature is 400OC, the as-obtained material exhibits the optim...