FeS2 nanosheets encapsulated in 3D porous carbon spheres for excellent Na storage in sodium-ion batteries. Issue 10 (29th August 2018)

• Record Type: Journal Article
• Authors: Wang, Fengbo; Li, Guangda; Meng, Xiangeng; Li, Yongxing; Gao, Qifa; Xu, Yaqia; Cui, Wenfeng
• Is Part Of: Inorganic chemistry frontiers. Volume 5:Issue 10(2018)
• Page Start: 2462
• Page End: 2471
• Publication Date: 2018-08-29
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8qi00679b
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : FeS2 nanosheets encapsulated in porous carbon layers were prepared by a facile method, which exhibited excellent performance of Na storage. Abstract : FeS2 nanosheets encapsulated in 3D porous carbon spheres (FeS2 @C-2 h) were fabricated by a series of treatments using Fe2 O3 hollow nanospheres as starting materials. We first fabricated Fe2 O3 @PPy by a facile process in solution. Then, Fe2 O3 @PPy was converted to Fe3 O4 @C by annealing treatment under an Ar atmosphere. Fe3 O4 @C composites were etched in HCl and they formed Fe3 O4 nanoparticles dispersed in porous carbon hollow spheres. Finally, the FeS2 nanosheets encapsulated in porous carbon hollow spheres were obtained by a sulfidation treatment. Thus, the FeS2 -carbon structure is believed to be beneficial for improving the sodium storage performance of the products. Our experimental results show that FeS2 @C-2 h exhibit a significantly improved electrochemical performance compared with pure FeS2 without carbon coating and etching when used as anode materials for sodium-ion batteries. At a current density of 500 mA g −1, the FeS2 @C-2 h anode delivered a high capacity of 514.9 mA h g −1 after 100 cycles. The capacity of 420.1 mA h g −1, 410.5 mA h g −1 and 396.6 mA h g −1 can be achieved at high current densities of 1000, 2000 and 3000 mA g −1 after 200 cycles, respectively. The capacity is still as high as 272.4 mA h g −1 after 500 cycles at a higher current density of 5000 mA g −1 . The excellent electrochemical performance suggests that the FeS2 @C-2 h nanomaterials hold potential to serve as electrode materials for sodium-ion batteries.