Controllable Preparation of Co-NC Nanoporous Carbon Derived from ZIF-67 for Advanced Lithium-sulfur Batteries

doi:10.15541/jim20180338

Abstract

Abstract:

This work reported a facile strategy for preparing S/Co-NC composite sulfur cathode materials with different Co loadings derived from ZIF-67, which were applied as cathode materials for Li-S batteries. SEM and TEM were used to observe the morphology and pore structure of Co-NC composite. XRD analysis was employed to investigate the crystalline state of cobalt embedded in porous carbon materials. N₂ adsorption-desorption techniques was used to characterize the BET surface area and pore volume of Co-NC samples. Experimental results showed that the Co-NC with Co content of 15.93wt% exhibited the superior electrochemical performance. The cathode equipped with optimized composite showed a high capacity retention rate of 94.84% between 50 ^th to 200 ^th cycles at 0.2C current density, and even at high current density (5.0C), a high discharge capacity of 718.8 mAh?g ^-1 could still be obtained.

Key words: metal-organic frameworks (MOFs), N-doped porous carbon, Li-S battery, cycle stability

CLC Number:

TM911

Shi-Qiang LUO, Chun-Man ZHENG, Wei-Wei SUN, Wei XIE, Jian-Huang KE, Shuang-Ke LIU, Xiao-Bin HONG, Yu-Jie LI, Jing XU. Controllable Preparation of Co-NC Nanoporous Carbon Derived from ZIF-67 for Advanced Lithium-sulfur Batteries[J]. Journal of Inorganic Materials, 2019, 34(5): 502-508.

Figures/Tables 9

Fig. 1 Schematic illustration of the preparation process of S/Co-NC(0~48 h) composites

Fig. 2 (a,c) SEM and (b,d) TEM images of (a-b) ZIF-67 precursors and (c-d) Co-NC (48 h); (e) TEM image and (f) EDS elemental mappings of S/Co-NC (48 h) composite

Fig. 3 XRD patterns of (a) ZIF-67 precursor, (b) Co-NC(0~ 48 h) and (c) S/Co-NC(48 h) composites

Table 1 BET results of ZIF-67 and Co-NC composites

Sample	BET surface area/(m²?g^-1)	Pore diameter /nm	Pore volume /(cm³?g^-1)
ZIF-67	1481.22	1.9919	0.7252
Co-NC(0 h)	272.15	8.2433	0.5608
Co-NC(6 h)	301.73	8.7121	0.6571
Co-NC(24 h)	344.41	9.6929	0.7016
Co-NC(48 h)	360.50	9.7984	0.8124

Fig. 4 (a) N2 adsorption-desorption isotherms and (b) pore size distributions of ZIF-67 and Co-NC(0~48 h) samples, (c) curves of variation trend of BET surface area and pore volume of Co-NC composites with increased etching time

Table 2 Elemental content of Co and N in Co-NC composites and N/C ratio data

Sample	Co-NC(0 h)	Co-NC(6 h)	Co-NC(24 h)	Co-NC(48 h)
Co/wt%	37.55	23.29	16.24	15.93
N/wt%	6.68	8.36	8.79	8.78
N/C	0.1070	0.1089	0.1056	0.1045

Fig. 5 TGA curves of S/Co-NC composites

Fig. 6 (a) CV curves and (b) discharge-charge profiles of S/Co-NC(0~48 h) electrodes with different Co contents

Fig. 7 (a) Cycle performances and (b) rate capabilities of S/Co-NC(0~48 h) electrodes with different Co contents; (c) Long-cycle performance of S/Co-NC(48 h) at 1.0C current density

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