Facile synthesis N-doped hollow carbon spheres from spherical solid silica

• Verfasst von: Wenelska, Karolina [VerfasserIn]
• Verfasst von: Ottmann, Alexander [VerfasserIn]
• Verfasst von: Schneider, Philip [VerfasserIn]
• Verfasst von: Klingeler, Rüdiger [VerfasserIn]
• Titel: Facile synthesis N-doped hollow carbon spheres from spherical solid silica
• Verf.angabe: K. Wenelska, A. Ottmann, D. Moszyński, P. Schneider, R. Klingeler, E. Mijowska
• E-Jahr: 2018
• Jahr: 1 February 2018
• Umfang: 6 S.
• Fussnoten: Available online 5 October 2017 ; Gesehen am 22.11.2018
• Titel Quelle: Enthalten in: Journal of colloid and interface science
• Ort Quelle: Amsterdam [u.a.] : Elsevier, 1966
• Jahr Quelle: 2018
• Band/Heft Quelle: 511(2018), Seite 203-208
• ISSN Quelle: 1095-7103
• DOI: doi:10.1016/j.jcis.2017.10.003
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Carbon materials
• Sach-SW: Hollow carbon spheres
• Sach-SW: Lithium ion batteries
• K10plus-PPN: 1583967923

Abstract

Nitrogen-doped core/shell carbon nanospheres (NHCS are prepared and their capability as an anode material in lithium-ion batteries is investigated. The synthesis methodology is based on a fast template route. The resulting molecular nanostructures are characterized by X-ray diffraction, transmission electron microscopy, thermal analysis, and nitrogen adsorption/desorption measurement as well as by cyclic voltammetry and galvanostatic cycling. The core/shell structure provides a rapid lithium transport pathway and boasts a highly reversible capacity. For undoped HCS the BET specific surface area is 623m2/g which increases up to 1000m2/g upon N-doping. While there is no significant effect of N-doping on the electrochemical performance at small scan rates, the doped NHCS shows better specific capacities than the pristine HCS at elevated rates. For instance, the discharge capacities in the 40th cycle, obtained at 1000mA/g, amount to 170mAh/g and 138mAh/g for NHCS and HCS, respectively.