High Energy Density Spinel LiCr0.2Ni0.4Mn1.4O4 Cathode Material Prepared by Spray Pyrolysis Method

doi:10.15541/jim20130656

Abstract

Abstract:

Cathode material of LiCr_0.2Ni_0.4Mn_1.4O₄ with high energy density and superior electrochemical properties was fabricated by means of spray pyrolysis. The material was characterized via thermogravimetric analysis (TG), X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in detail, and within the tolerance of current available electrolyte the discrepancy of different cut-off voltages (3.6-5.0 V, 3.6-5.2 V) was investigated. The results demonstrate that the obtained material is crystallized well without any formation of impurities, and a relative uniform particle size distribution is within micron and sub-micron. In the voltage window of 3.6-5.2 V, the initial discharge capacity can reach as high as 142.9 mAh/g at 0.5C, and its values of energy densitiy at 0.5C and 1C surpass 600 Wh/kg. If the cut-off voltage is set at 5.2 V, the degree of discharge and low-rate capacity are increased, while its high-rate capacity, cycling stability and working voltage platform are deteriorated seriously.

Key words: spray pyrolysis, spinel LiCr0.2Ni0.4Mn1.4O4, cut-off voltage, electrochemical property

CLC Number:

TQ152

CHEN Ming-Zhe, GUO Xiao-Dong, ZHONG Ben-He, YAN Hui-Min, ZHANG Ji-Bin, LIU Ju. High Energy Density Spinel LiCr_0.2Ni_0.4Mn_1.4O₄ Cathode Material Prepared by Spray Pyrolysis Method[J]. Journal of Inorganic Materials, 2014, 29(9): 917-923.

Figures/Tables 7

Fig. 1 TG-DTG-DTA curve of as-prepared percursor

Fig. 2 XRD patterns of precursor sample (a), sintered sample (b) and the comparative sample of non-doped of Cr (c)

Fig. 3 Different magnification SEM images of calcined sample (a-c) and corresponding particle size histogram (d)

Fig. 4 Rate performances of as-fabricated cells (3.6-5.0 V and 3.6-5.2 V, similarly hereinafter) at different discharge rates(a), cyclic stability performances of two batteries at 1C and 10C(b), discharge curves at different rates of two cells(c) and Ragone plots for both batteries (d)

Fig. 5 Cyclic voltammetry (CV) curves of two batteries

Fig. 6 A C impedance spectra of two cells (a) and the relationship between impedance and low frequency region, and the diffusion coefficients of Li+ of both (b)

Table 1 The calculated values of different resistances and diffusion coefficients of Li+

Cut-off voltage	R₁/Ω	R₂/Ω	D_Li⁺/(cm²?s^-1)
5.0 V	4.15	32.15	2.990×10^-11
5.2 V	3.62	89.67	1.435×10^-12

References 28

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High Energy Density Spinel LiCr_0.2Ni_0.4Mn_1.4O₄ Cathode Material Prepared by Spray Pyrolysis Method

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