Carbon-Coated ZnS-FeS2 Heterostructure as an Anode Material for Lithium-Ion Battery Applications |
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Authors: | Perumal Naveenkumar Munisamy Maniyazagan Nayoung Kang Hyeon-Woo Yang Woo-Seung Kang Sun-Jae Kim |
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Affiliation: | 1.Metal-Organic Compounds Materials Research Center, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;2.Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;3.Department of Metallurgical and Materials Engineering, Inha Technical College, Incheon 22212, Korea |
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Abstract: | The construction of carbon-coated heterostructures of bimetallic sulfide is an effective technique to improve the electrochemical activity of anode materials in lithium-ion batteries. In this work, the carbon-coated heterostructured ZnS-FeS2 is prepared by a two-step hydrothermal method. The crystallinity and nature of carbon-coating are confirmed by the investigation of XRD and Raman spectroscopy techniques. The nanoparticle morphology of ZnS and plate-like morphology of FeS2 is established by TEM images. The chemical composition of heterostructure ZnS-FeS2@C is discovered by an XPS study. The CV results have disclosed the charge storage mechanism, which depends on the capacitive and diffusion process. The BET surface area (37.95 m2g−1) and lower Rct value (137 Ω) of ZnS-FeS2@C are beneficial to attain higher lithium-ion storage performance. It delivered a discharge capacity of 821 mAh g−1 in the 500th continuous cycle @ A g−1, with a coulombic efficiency of around 100%, which is higher than the ZnS-FeS2 heterostructure (512 mAh g−1). The proposed strategy can improve the electrochemical performance and stability of lithium-ion batteries, and can be helpful in finding highly effective anode materials for energy storage devices. |
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Keywords: | hydrothermal carbon coating heterostructure lithium-ion battery ZnS-FeS2@C |
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