Hydrothermal Synthesis of NixCo1-xS2 and Its Discharge Performance in Thermal Batteries

doi:10.7503/cjcu20160168

Abstract

Abstract:

Ni_xCo_1-_xS₂(x=0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) powders were prepared by hydrothermal method using NiCl₂, CoSO₄ and Na₂S₂O₃and characterized with X-ray diffractometer(XRD), scanning electron microscope, laser particle size distribution analyzer and differential thermal analyser(DTA). A single cell was prepared with a Ni_xCo_1-_xS₂ cathode, a LiSi anode and a LiCl-KCl(MgO) molten salt electrolyte by pressed-power process. The effects of Ni and Co contents in Ni_xCo_1-_xS₂ cathode materials on the discharge performance of thermal battery were investigated. The results suggest that the single cell cathode material with Ni_0.3Co_0.7S₂ cathod has the best performance and the resistance is relatively low. The cell voltage can reach 1.899 V, and the specific capacity can reach 276.5 mA·h/g with a cut-off voltage of 1.5 V at a constant current density of 100 mA/cm² and a temperature of 450 ℃.

Key words: Thermal battery, Cathode material, Hydrothermal synthesis, NixCo1-xS2

CLC Number:

O646
O611

TrendMD:

YANG Kunkun,ZHAO Ping,YANG Shaohua,ZHAO Yanlong. Hydrothermal Synthesis of Ni_xCo_1-_xS₂ and Its Discharge Performance in Thermal Batteries[J]. Chem. J. Chinese Universities, 2016, 37(8): 1491.

Figures/Tables 10

Fig.1 X-ray diffraction patterns of NixCo1-xS2 with different Ni contents x: a. 0; b. 0.1; c. 0.3; d. 0.5; e. 0.7; f. 0.9; g. 1.0.

Fig.2 SEM images of NixCo1-xS2 with different Ni contents x: (A) 0; (B) 0.1; (C) 0.3; (D) 0.5; (E) 0.7; (F) 0.9; (G) 1.0.

Fig.3 EDX spectra of NixCo1-xS2 with different Ni contents x: (A) 0; (B) 0.1; (C) 0.3; (D) 0.5; (E) 0.7; (F) 0.9; (G) 1.0.

Table 1 EDX elemental microanalysis of the NixCo1-xS2 samples

x	w(%)					Ni/Co mass ratio
x	Ni	Co	S	O	C	Product	Feed
0	0	61.46	38.54	0	0
0.1	6.25	42.96	48.76	2.03	0	0.145	0.111
0.3	17.30	37.89	39.28	5.53	0	0.457	0.427
0.5	28.60	30.90	36.78	3.71	0	0.926	0.996
0.7	40.89	18.32	37.83	2.91	0.05	2.232	2.324
0.9	50.34	6.09	41.41	2.16	0	8.266	8.963
1.0	55.35	0	44.58	0	0.07

Fig.4 Particle size distributions of NixCo1-xS2 with different Ni contents

Table 2 Particle size distributions of NixCo1-xS2 with different Ni contents*

x	D10/μm	D50/μm	D90/μm
0	2.62	6.13	11.01
0.1	0.42	3.55	14.81
0.3	1.96	4.73	8.67
0.5	1.71	4.47	8.60
0.7	3.76	8.30	14.34
0.9	2.87	6.63	11.78
1.0	2.71	7.34	14.33

Fig.5 DTA curves of NixCo1-xS2 with different Ni contents

Fig.6 Discharge curves of LiSi/NixCo1-xS2 single cell with different Ni contents under 450 ℃ at 100 mA/cm2

Fig.7 Specific capacity of NixCo1-xS2 with different Ni contents a. Discharged to the cut-off voltage of 0.1 V; b. discharged to the cut-off voltage of 1.5 V.

Fig.8 Resistance values of LiSi/NixCo1-xS2 single cell with different Ni contents

References 25

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Hydrothermal Synthesis of Ni_xCo_1-_xS₂ and Its Discharge Performance in Thermal Batteries

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