Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 21, Pages 11449-11457Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta02517e
Keywords
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Funding
- National Key R&D Program of China [2019YFC1904500]
- National Natural Science Foundation of China (NSFC) [51502036, 21875037]
- Young Top Talent of Fujian Young Eagle Program
- Natural Science Foundation of Distinguished Young Scholars for Fujian Province [2019J06015]
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This study develops suitable anode materials for sodium/potassium-ion batteries, which have the potential to replace lithium-ion batteries. The fabricated composite electrode exhibits high capacities and superior long-life cycling capability, making it a promising candidate for electrochemical energy storage devices.
Sodium/potassium-ion batteries (SIBs/PIBs) are expected to replace conventional lithium-ion batteries (LIBs) soon in view of their lower cost and the abundant reserves of sodium/potassium resources. However, it remains a challenge to explore suitable anode materials for SIBs/PIBs with high energy/power density and long lifespan due to the sluggish kinetics during the insertion/extraction of Na+/K+ ions with larger ionic sizes. Herein, ultra-small SnS2 nanocrystals encapsulated in sulphurized polyacrylonitrile (SPAN) fibres have been fabricated via electrospinning paired with sulphuration treatment. Density functional theory (DFT) calculations demonstrate that SPAN fibre can concentrate Na+ on the surface and offer additional storage sites with enhanced reaction kinetics. Consequently, this composite electrode manifests superb sodium/potassium-ion storage performance with high capacities (613 mA h g(-1) after 50 cycles under 0.1 A g(-1) for SIBs; 565 mA h g(-1) at 0.05 A g(-1) and 226 mA h g(-1) at 5 A g(-1) after 50 and 2000 cycles for PIBs) and superior long-life cycling capability (261 mA h g(-1) after 30 000 cycles at 10 A g(-1) for SIBs). Additionally, a sodium full cell assembled with Na3V2(PO4)(3) as the cathode and SnS2-SPAN-470-1 as the anode displays excellent cycling performance. This work can provide new insights into the construction of novel transition metal dichalcogenide-based nanostructures and nanocomposites for high-performance electrochemical energy storage and conversion devices.
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