Stabilizing intermediate phases via the efficient confinement effects of the SnS2-SPAN fibre composite for ultra-stable half/full sodium/potassium-ion batteries. Issue 21 (18th May 2022)

• Record Type: Journal Article
• Authors: Wang, Yiyi; Chen, Xi; Chen, Xiaochuan; Lin, Chuyuan; Wang, Hong-En; Xiong, Peixun; Chen, Qinghua; Qian, Qingrong; Wei, Mingdeng; Zeng, Lingxing
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 21(2022)
• Page Start: 11449
• Page End: 11457
• Publication Date: 2022-05-18
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta02517e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The SnS2 -SPAN-470-1 composite was fabricated as a high-performance anode material for SIBs/PIBs. Abstract : 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 Na3 V2 (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.