Journal
NANO ENERGY
Volume 61, Issue -, Pages 626-636Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2019.04.041
Keywords
Transition metal disulfides; Rhenium disulfide; Sodium-ion batteries; Conversion reaction; Ex situ analysis; ab initio studies
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Funding
- Singapore Ministry of Education Academic Research Fund Tier 2 [MOE2015-T2-1-150]
- Singapore A*STAR IRG [A1783c0011]
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Rhenium disulfide (ReS2) has recently amassed increasing interests as lithium-ion batteries (LIBs) anode material due to its extremely weak interlayer coupling and high Li storage capacity. However, its potential as high-performance sodium-ion batteries (SIBs) has rarely been explored comprehensively. In this work, we demonstrate a novel construct of ReS2 anode consisting of vertical ReS2 nanosheets uniformly grown on metal-organic framework (MOF) derived porous carbonaceous nanocubes (RESNC), is able to achieve high-performance SIBs. Exhibiting high specific surface area (117.40 m(2) g(-1)) and near-microporous (similar to 2.20 nm) pore size distribution, this unique and conductive nanostructure provides abundant reactive sites which enable rapid and efficient ions/electrons transportation. For the first time, the sodiation/desodiation redox mechanisms of the ReS2-based nanostructure are revealed via ex situ investigations. Our results demonstrated that RESCN nanocomposite is endued with high capacity (365 mA h g(-1), 100 mA g(-1)), high rate capability (up to 2 A g(-1)) and stable cycling performance (> 600 cycles, 2 A g(-1)). To elaborate on the rate and cycling capabilities, various diffusion pathways of sodium-ions on the ReS2 lattice were unravelled via first-principles/ab initio techniques, with the results indicating favourable diffusion mechanics. Through the joint approach of comprehensive experimental and theoretical investigations, our results suggest that the ReS2/C composites are highly promising as highperformance SIBs anode materials, as well as broadening the current perspectives of materials choices as far as high capacity transition metal disulfides (TMDs) is concerned.
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