A carbon-coated shuttle-like Fe2O3/Fe1- x S heterostructure derived from metal-organic frameworks with high pseudocapacitance for ultrafast lithium storage

Guang Zhu; Xiaojie Zhang; Yanjiang Li; Guangzhen Zhao; Haifeng Xu; Zhong Jin

doi:10.1039/d0na00372g

A carbon-coated shuttle-like Fe₂O₃/Fe_{1- x} S heterostructure derived from metal-organic frameworks with high pseudocapacitance for ultrafast lithium storage

Nanoscale Adv. 2020 Jul 21;2(11):5201-5208. doi: 10.1039/d0na00372g. eCollection 2020 Nov 11.

Authors

Guang Zhu¹, Xiaojie Zhang^{2

3}, Yanjiang Li¹, Guangzhen Zhao¹, Haifeng Xu¹, Zhong Jin⁴

Affiliations

¹ Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University Suzhou 234000 P. R. China guangzhu@ahsztc.edu.cn Xuhaifeng@ahszu.edu.cn.
² National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaiyin Institute of Technology Huaian 223003 China.
³ School of Electrical and Power Engineering, China University of Mining and Technology Xuzhou 221116 China.
⁴ Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 China.

Abstract

Pursuing active, low-cost, and stable electrode materials with superior rate capability and long-life cycling performances for lithium-ion batteries remains a big challenge. In this study, a carbon-coated shuttle-like Fe₂O₃/Fe_1-x S heterostructure is synthesized by simply annealing Fe-based metal-organic frameworks (MIL-88(Fe)) as precursors and sublimed sulfur. Carbon-coated Fe₂O₃/Fe_1-x S displays a unique structure with ultrafine Fe₂O₃/Fe_1-x S nanoparticles distributed in the hollow and porous carbon matrix, which offers a large specific surface area and fast charge transfer ability, and alleviates the volume change upon cycling. When evaluated as an anode material for lithium-ion batteries, it exhibits an ultra-high specific capacity of 1200 mA h g^-1 at 0.1 A g^-1, and superior high rate capability with a capacity of 345 mA h g^-1 at a very high current density of 5.0 A g^-1 owing to its high electrical conductivity and enhanced pseudocapacitive contribution from surface effects. The current strategy is promising to synthesize the carbon-coated porous structure from metal-organic frameworks for next-generation energy-storage applications.