Na2FePO4F/Biocarbon Nanocomposite Hollow Microspheres Derived from Biological Cell Template as High‐Performance Cathode Material for Sodium‐Ion Batteries. Issue 35 (21st May 2021)

• Record Type: Journal Article
• Authors: Li, Haiming; Wang, Tailin; Wang, Xue; Li, Guangda; Shen, Jianxing; Chai, Jinling
• Is Part Of: Chemistry. Volume 27:Issue 35(2021)
• Page Start: 9022
• Page End: 9030
• Publication Date: 2021-05-21
• Subjects: biological cell template -- green cathode fabrication -- hollow microspheres -- mesoporous carbon coating -- Na2FePO4F -- sodium-ion batteries; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202100096
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: We have successfully synthesized Na2 FePO4 F/biocarbon nanocomposite hollow microspheres from Fe III precursor as cathodes for sodium‐ion batteries through self‐assembly of yeast cell biotemplate and sol‐gel technology. The carbon coating on the nanoparticle surface with a mesoporous structure enhances electron diffusion into Na2 FePO4 F crystal particles. The improved electrochemical performance of Na2 FePO4 F/biocarbon nanocomposites is attributed to the larger electrode−electrolyte contact area and more active sites for Na + on the surface of hollow microspheres compared with those of Na2 FePO4 F/C. The Na2 FePO4 F/biocarbon nanocomposite exhibits a high initial discharge capacity of 114.3 mAh g −1 at 0.1 C, long‐cycle stability with a capacity retention of 74.3 % after 500 cycles at 5 C, and excellent rate capability (70.2 mAh g −1 at 5 C) compared with Na2 FePO4 F/C. This novel nanocomposite hollow microsphere structure is suitable for improving the property of other cathode materials for high‐power batteries. Abstract : Na2 FePO4 F/biocarbon nanocomposite hollow microspheres were synthesized through self‐assembly of yeast cell biotemplates. The electrode delivered high initial capacity (114.3 mAh g −1 at 0.1 C), long‐cycle stability (74.3 % retention after 500 cycles at 5 C), and high rate capability (70.2 mAh g −1 at 5 C).