Effects of Washing and Heat-treatment on Structure and Electrochemical Charge/Discharge Property of LiNi0.8Co0.15Al0.05O2 Powder

doi:10.15541/jim20150644

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 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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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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