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

K Wenelska; A Ottmann; D Moszyński; P Schneider; R Klingeler; E Mijowska

doi:10.1016/j.jcis.2017.10.003

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

J Colloid Interface Sci. 2018 Feb 1:511:203-208. doi: 10.1016/j.jcis.2017.10.003. Epub 2017 Oct 5.

Authors

K Wenelska¹, A Ottmann², D Moszyński³, P Schneider⁴, R Klingeler⁵, E Mijowska³

Affiliations

¹ Nanomaterials Physicochemistry Department, Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, al. Piastów 45, 70-322 Szczecin, Poland. Electronic address: kwenelska@zut.edu.pl.
² Kirchhoff Institute of Physics, Heidelberg University, INF 227, 69120 Heidelberg, Germany. Electronic address: alexander.ottmann@kip.uni-heidelberg.de.
³ Nanomaterials Physicochemistry Department, Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, al. Piastów 45, 70-322 Szczecin, Poland.
⁴ Kirchhoff Institute of Physics, Heidelberg University, INF 227, 69120 Heidelberg, Germany.
⁵ Kirchhoff Institute of Physics, Heidelberg University, INF 227, 69120 Heidelberg, Germany; Centre for Advanced Materials (CAM), Heidelberg University, INF 225, 69120 Heidelberg, Germany.

PMID: 29024860
DOI: 10.1016/j.jcis.2017.10.003

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.

Keywords: Carbon materials; Hollow carbon spheres; Lithium ion batteries.