无人机用锂离子电池正极材料Li1.20Mn0.54Ni0.13Co0.13O2的Mo6+掺杂改性研究
收稿日期: 2020-06-25
网络出版日期: 2021-11-15
Study on Mo6+ doping into Li1.20Mn0.54Ni0.13Co0.13O2 as cathode materials for Li-ion batteries applied in unmanned aerial vehicles
Received date: 2020-06-25
Online published: 2021-11-15
采用碳酸盐共沉淀法和高温烧结工艺将一定量的Mo6+掺杂到Li1.20Mn0.54Ni0.13Co0.13O2正极材料中。利用XRD、SEM、EDS和恒流测试仪研究Mo6+掺杂对Li1.20Mn0.54Ni0.13Co0.13O2正极材料的晶体结构、微观形貌和电化学性能的影响。结果显示,Li1.20Mn0.52Ni0.13Co0.13Mo0.02O2表现出更低的阳离子混排和优异的电化学性能。经过Mo6+掺杂后的正极,由于Li+高速的迁移速率,使得首次不可逆容量损失降低,并展现出更好的高倍率性能和优异的循环稳定性。在0.5C倍率下循环100周后,Li1.20Mn0.52Ni0.13Co0.13Mo0.02O2的容量保持率达到92.2%,远远大于Li1.20Mn0.54Ni0.13Co0.13O2的87.5%。另外,当放电倍率增大到5C时,Li1.20Mn0.54Ni0.13Co0.13O2的放电比容量要比Li1.20Mn0.52Ni0.13Co0.13Mo0.02O2低21.0 mA·h/g。因此,采用Mo6+掺杂改性Li1.20Mn0.54Ni0.13Co0.13O2正极材料,可以有效提高锂电池的循环保持率和高倍率放电性能。
关键词： 无人机; 锂离子电池; Li1.20Mn0.54Ni0.13Co0.13O2; Mo6+ 掺杂; 电化学性能
张亚锋 , 李宏伟 , 赵志坚 . 无人机用锂离子电池正极材料Li1.20Mn0.54Ni0.13Co0.13O2的Mo6+掺杂改性研究[J]. 无机盐工业, 2021 , 53(11) : 81 -85 . DOI: 10.19964/j.issn.1006-4990.2020-0365
A certain content of Mo6+ was doped into the Li1.20Mn0.54Ni0.13Co0.13O2 cathode materials via using the carbonate co-precipitation method and high temperature calcination process.The influences of doping Mo6+ on crystal structure, morphology and electrochemical properties of the cathode materials were investigated by XRD, SEM, EDS and galvanostatic charge-discharge tests.The results showed that the Li1.20Mn0.52Ni0.13Co0.13Mo0.02O2 exhibited lower cation mixing and excellent electro-chemical properties.Due to the high migration rate of Li+, the first irreversible capacity loss of the Mo6+ doped cathode was reduced, which led to better high rate performance and excellent cycle stability.After 100 cycles at 0.5C, the capacity retention rate of Li1.20Mn0.52Ni0.13Co0.13Mo0.02O2 was 92.2%, which was much higher than that of Li1.20Mn0.54Ni0.13Co0.13O2（87.5%）. In addition, when the discharge rate increased to 5C the discharge capacity of Li1.20Mn0.54Ni0.13Co0.13O2 was 21.0 mA·h/g lower than that of Li1.20Mn0.52Ni0.13Co0.13Mo0.02O2.Therefore, using Mo6+ doping Li1.20Mn0.54Ni0.13Co0.13O2 cathode materials could effectively improve the cycle retention and high rate discharge performance of lithium-ion battery.
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