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

doi:10.19964/j.issn.1006-4990.2020-0365

摘要/Abstract

摘要：

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Li_1.20Mn_0.54Ni_0.13Co_0.13O₂正极材料中。利用XRD、SEM、EDS和恒流测试仪研究Mo⁶⁺掺杂对Li_1.20Mn_0.54Ni_0.13Co_0.13O₂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,Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂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,Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂的容量保持率达到92.2%,远远大于Li_1.20Mn_0.54Ni_0.13Co_0.13O₂的87.5%。另外,当放电倍率增大到5C时,Li_1.20Mn_0.54Ni_0.13Co_0.13O₂的放电比容量要比Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂低21.0 mA·h/g。因此,采用Mo⁶⁺掺杂改性Li_1.20Mn_0.54Ni_0.13Co_0.13O₂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, Li_1.20Mn_0.54Ni_0.13Co_0.13O₂, Mo⁶⁺ 掺杂, 电化学性能

Abstract:

A certain content of Mo⁶⁺ was doped into the Li_1.20Mn_0.54Ni_0.13Co_0.13O₂ 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 Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂ 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 Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂ was 92.2%, which was much higher than that of Li_1.20Mn_0.54Ni_0.13Co_0.13O₂（87.5%）. In addition, when the discharge rate increased to 5C the discharge capacity of Li_1.20Mn_0.54Ni_0.13Co_0.13O₂ was 21.0 mA·h/g lower than that of Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂.Therefore, using Mo⁶⁺ doping Li_1.20Mn_0.54Ni_0.13Co_0.13O₂ cathode materials could effectively improve the cycle retention and high rate discharge performance of lithium-ion battery.

Key words: unmanned aerial vehicles, Li-ion batteries, Li_1.20Mn_0.54Ni_0.13Co_0.13O₂, Mo⁶⁺ doping, electrochemical property

中图分类号:

TQ137.12

张亚锋,李宏伟,赵志坚. 无人机用锂离子电池正极材料Li_1.20Mn_0.54Ni_0.13Co_0.13O₂的Mo⁶⁺掺杂改性研究[J]. 无机盐工业, 2021, 53(11): 81-85.

ZHANG Yafeng,LI Hongwei,ZHAO Zhijian. Study on Mo⁶⁺ doping into Li_1.20Mn_0.54Ni_0.13Co_0.13O₂ as cathode materials for Li-ion batteries applied in unmanned aerial vehicles[J]. Inorganic Chemicals Industry, 2021, 53(11): 81-85.

图/表 8

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样品	a/nm	c/nm	c/a	I_（003）/I_（104）
Li_1.20Mn_0.54Ni_0.13Co_0.13O₂	0.284 8	1.420 7	4.988	1.62
Li_1.20Mn_0.52Ni_0.13Co_0.13Mo_0.02O₂	0.286 2	1.428 9	4.993	1.74

x	元素理论化学计量比				元素实验化学计量比
x	Mn	Ni	Co	Mo	Mn	Ni	Co	Mo
0.00	0.540	0.130	0.130	0.000	0.542	0.127	0.131	0.000
0.02	0.520	0.130	0.130	0.020	0.519	0.131	0.129	0.021

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无人机用锂离子电池正极材料Li_1.20Mn_0.54Ni_0.13Co_0.13O₂的Mo⁶⁺掺杂改性研究

Study on Mo⁶⁺ doping into Li_1.20Mn_0.54Ni_0.13Co_0.13O₂ as cathode materials for Li-ion batteries applied in unmanned aerial vehicles

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