Crystalline/Non-Crystalline Carbon Co-Modified Strategy to Construct N, S Co-Doped Carbon Layer Wrapped Fe0.95S1.05/Carbon Nanotubes for Enhanced Lithium Storage Property

doi:10.1007/s40195-024-01776-z

Abstract

Abstract:

Due to their high theoretical capacity and abundant resources, transition metal sulfides are regarded as a prospering alternative to replace the commercial graphite anode in lithium-ion batteries (LIBs), particularly for large-scale energy storage and conversion applications. Nonetheless, low conductivity, easy agglomeration and obvious volume change greatly impede their practical application. In this work, a novel crystalline/non-crystalline carbon co-modified strategy is proposed to fabricate N, S co-doped carbon (NSC) layer wrapped Fe_0.95S_1.05/carbon nanotubes (CNTs) composite (Fe_0.95S_1.05/CNTs@NSC) through a simple Fenton reaction followed by a sulfurization process. Systematical characterizations and analyses reveal that this strategy well combines the advantages of crystalline CNTs and non-crystalline NSC, ensuring good conductivity and a high contribution to capacity from the carbon matrix. Meanwhile, the joint encapsulation of Fe_0.95S_1.05 by both CNTs and NSC can significantly mitigate the agglomeration and volume change of Fe_0.95S_1.05 during the continuous charge/discharge process. Benefiting from these advantageous features, the resultant Fe_0.95S_1.05/CNTs@NSC composite displays much improved cycling stability and rate capability when compared to the counterparts. Clearly, our research offers a distinct and innovative approach to design and construct advanced transition metal sulfides/carbon composite anodes for LIBs.

Key words: Lithium-ion batteries, Crystalline/non-crystalline carbon, Joint encapsulation, Fe_0.95S_1.05/CNTs@NSC, Lithium storage property

Liang Chen, Lan−Yun Yang, Li−Ting Zeng, Xu Liu, Xin−Rui Li, Yu−Shan Tian, Wei Wang, Gang−Yong Li, Chen−Xi Xu, Zhao−Hui Hou. Crystalline/Non-Crystalline Carbon Co-Modified Strategy to Construct N, S Co-Doped Carbon Layer Wrapped Fe_0.95S_1.05/Carbon Nanotubes for Enhanced Lithium Storage Property[J]. Acta Metallurgica Sinica (English Letters), 2025, 38(1): 93-101.

Figures/Tables 6

Fig. 1 Schematic diagram of the preparation of Fe0.95S1.05/CNTs@NSC composite

Fig. 2 SEM images of Fe0.95S1.05/CNTs@NSC a, Fe0.95S1.05/CNTs b and Fe0.95S1.05 c, TEM image d, magnified TEM image e, EDX pattern f, scanning TEM image g and element mapping images h − k of Fe0.95S1.05/CNTs@NSC

Fig. 3 XRD patterns a, Raman spectra b and XPS survey spectra of different samples c, high-resolution S 2p d, Fe 2p e and N 1s spectra f of Fe0.95S1.05/CNTs@NSC

Fig. 4 N2 adsorption/desorption isotherm curves a and pore size distribution curves b of different samples

Fig. 5 CV curves a and charge/discharge curves b of Fe0.95S1.05/CNTs@NSC electrode for different cycles; cycling performance c and rate performance d

Fig. 6 CV curves at different scan rates a, relationship between peak current and scan rate b and capacitance contribution ratios at different scan rates for Fe0.95S1.05/CNTs@NSC electrode c, Nyquist plots of different electrodes d

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