洗涤和热处理对LiNi0.8Co0.15Al0.05O2正极材料结构和电化学充放电性能的影响

doi:10.15541/jim20150644

摘要/Abstract

摘要：

用去离子水将原始的LiNi_0.8Co_0.15Al_0.05O₂正极材料进行洗涤并分别在不同温度下处理相同的时间, 讨论了LiNi_0.8Co_0.15Al_0.05O₂正极材料结构、形貌以及电化学充放电性能的变化, 同时探讨了洗涤和热处理对材料结构、电化学充放电性能以及倍率性能影响的机理。XRD分析表明: 在洗涤和热处理之后, LiNi_0.8Co_0.15Al_0.05O₂正极材料的I₍₀₀₃₎/I₍₁₀₄₎比值以及晶胞体积均有变小; 傅里叶红外光谱分析表明: 在洗涤和热处理之后, LiNi_0.8Co_0.15Al_0.05O₂正极材料中形成了碳酸锂、镍化合物杂质及其相关变化。同时对洗涤和热处理前后LiNi_0.8Co_0.15Al_0.05O₂正极材料容量和倍率性能进行测试。容量测试结果表明: 原始样品以及处理后样品在30圈循环之后容量保持率分别为88.87%、 87.21%、85.43%和87.80%。

关键词: LiNi0.8Co0.15Al0.05O2正极材料, 洗涤和热处理, 充放电, 容量

Abstract:

The effect of washing on electrochemical properties of Ni-rich layered cathode LiNi_0.8Co_0.15Al_0.05O₂powder is widely known, but few literatures have reported thoroughly. Primitive LiNi_0.8Co_0.15Al_0.05O₂powders processed by deionized water and heat-treatment at different temperatures in a paralleling time was explored for the first time. Significant changes of structure, morphology and electrochemical charge/discharge property of the LiNi_0.8Co_0.15Al_0.05O₂cathode were detected comprehensively. Mechanism of washing and heat-treatment on the structure and electrochemical charge/discharge property and the rate performance were studied. XRD patterns show the I₍₀₀₃₎/I₍₁₀₄₎ value of LiNi_0.8Co_0.15Al_0.05O₂powders decreases and the volume turns smaller after being washed and heat-treated. FT-IR spectra confirm the existence of lithium carbonate, and nickel compounds and their relative changes in the LiNi_0.8Co_0.15Al_0.05O₂ powders. The specific capacity and rate performance of the LiNi_0.8Co_0.15Al_0.05O₂powders were carried out before and after washing and heat-treatment. The capacities of primitive sample and treated samples remain 88.87%, 87.21%, 85.43% and 87.80% after 30 cycles, respectively.

Key words: LiNi0.8Co0.15Al0.05O2 powder, washing and heat-treatment, charge/discharge, capacity

中图分类号:

TQ174

李荐, 陈宝荣, 周宏明. 洗涤和热处理对LiNi_0.8Co_0.15Al_0.05O₂正极材料结构和电化学充放电性能的影响[J]. 无机材料学报, 2016, 31(7): 773-778.

LI Jian, CHEN Bao-Rong, ZHOU Hong-Ming. Effects of Washing and Heat-treatment on Structure and Electrochemical Charge/Discharge Property of LiNi_0.8Co_0.15Al_0.05O₂ Powder[J]. Journal of Inorganic Materials, 2016, 31(7): 773-778.

图/表 8

Table 1 Water content of primitive LiNi0.8Co0.15Al0.05O2 powder (M1) and treated samples (N1, N2, N3)

Samples	M1	N1	N2	N3
Water content/(×10^-6)	500.16	1552.45	257.95	207.74

Fig. 1 TG-DSC curves of primitive LiNi0.8Co0.15Al0.05O2 powder M1 (a) and moist M1 (b)

Fig. 2 XRD patterns of primitive LiNi0.8Co0.15Al0.05O2 powder (M1) and treated samples (N1, N2, N3)

Table 2 Lattice constant, c/a ratio, I(003)/I(104), R, and V of primitive LiNi0.8Co0.15Al0.05O2 powder (M1) and treated samples (N1, N2, N3)

Samples	a/nm	c/nm	c/a	I₍₀₀₃₎/I₍₁₀₄₎	R	V/(×10^-5, nm³)
M1	0.2868	1.4183	4.945	1.18	0.40	1.0101
N1	0.2867	1.4177	4.945	1.16	0.42	1.0091
N2	0.2867	1.4180	4.946	1.18	0.42	1.0092
N3	0.2867	1.4178	4.945	1.11	0.44	1.0090

Fig. 3 SEM images for primitive LiNi0.8Co0.15Al0.05O2 powder M1 (a, b) and treated samples N1 (c, d), N2 (e, f) and N3 (g, h)

Fig. 4 FT-IR spectra of primitive LiNi0.8Co0.15Al0.05O2 powder (M1) and treated samples (N1, N2, N3)

Fig. 5 Initial (a) and the 30th cycle (b) charge and discharge curves at 0.2C of primitive LiNi0.8Co0.15Al0.05O2 powder (M1) and treated samples (N1, N2, N3)

Fig. 6 Rate performances of primitive LiNi0.8Co0.15Al0.05O2 powder (M1) and treated samples (N1, N2, N3)

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洗涤和热处理对LiNi_0.8Co_0.15Al_0.05O₂正极材料结构和电化学充放电性能的影响

Effects of Washing and Heat-treatment on Structure and Electrochemical Charge/Discharge Property of LiNi_0.8Co_0.15Al_0.05O₂ Powder

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