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Three-dimensional iron sulfide-carbon interlocked graphene composites for high-performance sodium-ion storage
Huang, Wei; Sun, Hongyu; Shangguan, Huihui; Cao, Xianyi; Xiao, Xinxin; Shen, Fei; Mølhave, Kristian; Ci, Lijie; Si, Pengchao; Zhang, Jingdong
Three-dimensional (3D) carbon-wrapped iron sulfide interlocked graphene (Fe7S8@C-G) composites for high-performance sodium-ion storage are designed and produced through electrostatic interaction and subsequent sulfurization. The ironbased metal-organic frameworks (MOFs, MIL-88-Fe) interact with graphene oxide sheets to form 3D networks, and carbon-wrapped iron sulfide (Fe7S8@C) nanoparticles with high individual-particle conductivity are prepared following a sulfurization process, surrounded by interlocked graphene sheets to enhance the interparticle conductivity. The prepared Fe7S8@C-G composites not only have the improved individual-particle and interparticle conductivity to shorten electron/ion diffusion pathways, but also have the enhanced structural stability to prevent the aggregation of active materials and buffer large volume charges during sodiation / desodiation. As a sodium-ion storage material, the Fe7S8@CG composites exhibit a reversible capacity of 449 mA h g-1 at 500 mA g-1 after 150 cycles and a retention capacity of 306 mA h g-1 under a current density of 2000 mA g-1. The crucial factors related to the structural changes and stability during cycles have been further investigated. These results demonstrate that the high-performance sodium-ion storage properties are mainly attributed to the unique designed three-dimensional configuration.
Keyword(s): electrical energy storage devices; sodium ion batteries (SIBs)
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University of Limerick
Citation(s): Nanoscale;10, pp. 7851-7859
Publisher(s): Royal Society of Chemistry
First Indexed: 2018-05-20 06:25:39 Last Updated: 2019-03-24 06:37:22